lead /ˈlid/
 (vt.)領導,率領,領先;引導,帶領;攙,牽;致使,誘使,影響;過,使某人過(vi.)領導


 lead /ˈlɪd/ 名詞
 前驅場,前導物,鉛,領導


 lead
 柱式引線


 lead
 引線 前置


 Lead n.
 1. Chem. One of the elements, a heavy, pliable, inelastic metal, having a bright, bluish color, but easily tarnished.  It is both malleable and ductile, though with little tenacity, and is used for tubes, sheets, bullets, etc. Its specific gravity is 11.37. It is easily fusible (melting point 327.5° C), forms alloys with other metals, and is an ingredient of solder and type metal. Atomic number 82.  Atomic weight, 207.2. Symbol Pb (L. Plumbum). It is chiefly obtained from the mineral galena, lead sulphide.
 2. An article made of lead or an alloy of lead; as: (a) A plummet or mass of lead, used in sounding at sea. (b) Print. A thin strip of type metal, used to separate lines of type in printing. (c) Sheets or plates of lead used as a covering for roofs; hence, pl., a roof covered with lead sheets or terne plates.
    I would have the tower two stories, and goodly leads upon the top.   --Bacon
 3. A small cylinder of black lead or graphite, used in pencils.
 Black lead, graphite or plumbago; -- so called from its leadlike appearance and streak. [Colloq.]
 Coasting lead, a sounding lead intermediate in weight between a hand lead and deep-sea lead.
 Deep-sea lead, the heaviest of sounding leads, used in water exceeding a hundred fathoms in depth. --Ham. Nav. Encyc.
 Hand lead, a small lead use for sounding in shallow water.
 Krems lead, Kremnitz lead [so called from Krems or Kremnitz, in Austria], a pure variety of white lead, formed into tablets, and called also Krems white, or Kremnitz white, and Vienna white.
 Lead arming, tallow put in the hollow of a sounding lead. See To arm the lead (below).
 Lead colic. See under Colic.
 Lead color, a deep bluish gray color, like tarnished lead.
 Lead glance. Min. Same as Galena.
 Lead line (a) Med. A dark line along the gums produced by a deposit of metallic lead, due to lead poisoning. (b) Naut. A sounding line.
 Lead mill, a leaden polishing wheel, used by lapidaries.
 Lead ocher Min., a massive sulphur-yellow oxide of lead. Same as Massicot.
 Lead pencil, a pencil of which the marking material is graphite (black lead).
 Lead plant Bot., a low leguminous plant, genus Amorpha (Amorpha canescens), found in the Northwestern United States, where its presence is supposed to indicate lead ore. --Gray.
 Lead tree. (a) Bot. A West Indian name for the tropical, leguminous tree, Leucæna glauca; -- probably so called from the glaucous color of the foliage. (b) Chem. Lead crystallized in arborescent forms from a solution of some lead salt, as by suspending a strip of zinc in lead acetate.
 Mock lead, a miner's term for blende.
 Red lead, a scarlet, crystalline, granular powder, consisting of minium when pure, but commonly containing several of the oxides of lead. It is used as a paint or cement and also as an ingredient of flint glass.
 Red lead ore Min., crocoite.
 Sugar of lead, acetate of lead.
 To arm the lead, to fill the hollow in the bottom of a sounding lead with tallow in order to discover the nature of the bottom by the substances adhering. --Ham. Nav. Encyc.
 To cast the lead, or To heave the lead, to cast the sounding lead for ascertaining the depth of water.
 White lead, hydrated carbonate of lead, obtained as a white, amorphous powder, and much used as an ingredient of white paint.


 Lead v. i.
 1. To guide or conduct, as by accompanying, going before, showing, influencing, directing with authority, etc.; to have precedence or preëminence; to be first or chief; -- used in most of the senses of lead, v. t.
 2. To tend or reach in a certain direction, or to a certain place; as, the path leads to the mill; gambling leads to other vices.
    The mountain foot that leads towards Mantua.   --Shak.
 To lead off or To lead out, to go first; to begin; as, Mickey Mantle led off in the fifth inning of the game.


 Lead v. t. [imp. & p. p. Leaded; p. pr. & vb. n. Leading.]
 1. To cover, fill, or affect with lead; as, continuous firing leads the grooves of a rifle.
 2. Print. To place leads between the lines of; as, to lead a page; leaded matter.


 Lead v. t. [imp. & p. p. Led p. pr. & vb. n. Leading.]
 1. To guide or conduct with the hand, or by means of some physical contact or connection; as, a father leads a child; a jockey leads a horse with a halter; a dog leads a blind man.
    If a blind man lead a blind man, both fall down in the ditch.   --Wyclif (Matt. xv. 14.)
    They thrust him out of the city, and led him unto the brow of the hill.   --Luke iv. 29.
 In thy right hand lead with thee
 The mountain nymph, sweet Liberty.   --Milton.
 2. To guide or conduct in a certain course, or to a certain place or end, by making the way known; to show the way, esp. by going with or going in advance of.  Hence, figuratively: To direct; to counsel; to instruct; as, to lead a traveler; to lead a pupil.
    The Lord went before them by day in a pillar of a cloud, to lead them the way.   --Ex. xiii. 21.
    He leadeth me beside the still waters.   --Ps. xxiii. 2.
 This thought might lead me through the world's vain mask.
 Content, though blind, had I no better guide.   --Milton.
 3. To conduct or direct with authority; to have direction or charge of; as, to lead an army, an exploring party, or a search; to lead a political party.
    Christ took not upon him flesh and blood that he might conquer and rule nations, lead armies, or possess places.   --South.
 4. To go or to be in advance of; to precede; hence, to be foremost or chief among; as, the big sloop led the fleet of yachts; the Guards led the attack; Demosthenes leads the orators of all ages.
    As Hesperus, that leads the sun his way.   --Fairfax.
    And lo ! Ben Adhem's name led all the rest.   --Leigh Hunt.
 5. To draw or direct by influence, whether good or bad; to prevail on; to induce; to entice; to allure; as, to lead one to espouse a righteous cause.
    He was driven by the necessities of the times, more than led by his own disposition, to any rigor of actions.   --Eikon Basilike.
    Silly women, laden with sins, led away by divers lusts.   --2 Tim. iii. 6 (Rev. Ver.).
 6. To guide or conduct one's self in, through, or along (a certain course); hence, to proceed in the way of; to follow the path or course of; to pass; to spend. Also, to cause (one) to proceed or follow in (a certain course).
    That we may lead a quiet and peaceable life.   --1 Tim. ii. 2.
 Nor thou with shadowed hint confuse
 A life that leads melodious days.   --Tennyson.
    You remember . . . the life he used to lead his wife and daughter.   --Dickens.
 7. Cards & Dominoes To begin a game, round, or trick, with; as, to lead trumps; the double five was led.
 To lead astray, to guide in a wrong way, or into error; to seduce from truth or rectitude.
 To lead captive, to carry or bring into captivity.
 To lead the way, to show the way by going in front; to act as guide. --Goldsmith.


 Lead, n.
 1. The act of leading or conducting; guidance; direction; as, to take the lead; to be under the lead of another.
    At the time I speak of, and having a momentary lead, . . . I am sure I did my country important service.   --Burke.
 2. Precedence; advance position; also, the measure of precedence; as, the white horse had the lead; a lead of a boat's length, or of half a second.
 3. Cards & Dominoes The act or right of playing first in a game or round; the card suit, or piece, so played; as, your partner has the lead.
 4. An open way in an ice field.
 5. Mining A lode.
 6. Naut. The course of a rope from end to end.
 7. Steam Engine The width of port opening which is uncovered by the valve, for the admission or release of steam, at the instant when the piston is at end of its stroke.
 Note: ☞ When used alone it means outside lead, or lead for the admission of steam. Inside lead refers to the release or exhaust.
 8. Civil Engineering the distance of haul, as from a cutting to an embankment.
 9. Horology The action of a tooth, as a tooth of a wheel, in impelling another tooth or a pallet.
 10. Music. (a) The announcement by one voice part of a theme to be repeated by the other parts. (b) A mark or a short passage in one voice part, as of a canon, serving as a cue for the entrance of others.
 11.  In an internal-combustion engine, the distance, measured in actual length of piston stroke or the corresponding angular displacement of the crank, of the piston from the end of the compression stroke when ignition takes place; -- called in full lead of the ignition. When ignition takes place during the working stroke the corresponding distance from the commencement of the stroke is called negative lead.
 12.  Mach. The excess above a right angle in the angle between two consecutive cranks, as of a compound engine, on the same shaft.
 13.  Mach. In spiral screw threads, worm wheels, or the like, the amount of advance of any point in the spiral for a complete turn.
 14.  Elec. (a) The angle between the line joining the brushes of a continuous-current dynamo and the diameter symmetrical between the poles. (b) The advance of the current phase in an alternating circuit beyond that of the electromotive force producing it.
 15.  Theat. A role for a leading man or leading woman; also, one who plays such a role.
 Lead angle Steam Engine, the angle which the crank maker with the line of centers, in approaching it, at the instant when the valve opens to admit steam.
 Lead screw Mach., the main longitudinal screw of a lathe, which gives the feed motion to the carriage.

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 lead
      n 1: a soft heavy toxic malleable metallic element; bluish white
           when freshly cut but tarnishes readily to dull gray;
           "the children were playing with lead soldiers" [syn: Pb,
            atomic number 82]
      2: an advantage held by a competitor in a race; "he took the
         lead at the last turn"
      3: evidence pointing to a possible solution; "the police are
         following a promising lead"; "the trail led straight to
         the perpetrator" [syn: track, trail]
      4: a position of leadership (especially in the phrase `take the
         lead'); "he takes the lead in any group"; "we were just
         waiting for someone to take the lead"; "they didn't follow
         our lead"
      5: the angle between the direction a gun is aimed and the
         position of a moving target (correcting for the flight
         time of the missile)
      6: the introductory section of a story; "it was an amusing
         lead-in to a very serious matter" [syn: lead-in]
      7: an actor who plays a principal role [syn: star, principal]
      8: (baseball) the position taken by a base runner preparing to
         advance to the next base; "he took a long lead off first"
      9: an indication of potential opportunity; "he got a tip on the
         stock market"; "a good lead for a job" [syn: tip, steer,
          confidential information, wind, hint]
      10: a news story of major importance [syn: lead story]
      11: the timing of ignition relative to the position of the
          piston in an internal-combustion engine [syn: {spark
          advance]
      12: restraint consisting of a rope (or light chain) used to
          restrain an animal [syn: leash, tether]
      13: thin strip of metal used to separate lines of type in
          printing [syn: leading]
      14: mixture of graphite with clay in different degrees of
          hardness; the marking substance in a pencil [syn: {pencil
          lead]
      15: a jumper that consists of a short piece of wire; "it was a
          tangle of jumper cables and clip leads" [syn: {jumper
          cable, jumper lead]
      16: the playing of a card to start a trick in bridge; "the lead
          was in the dummy"
      v 1: take somebody somewhere; "We lead him to our chief"; "can
           you take me to the main entrance?"; "He conducted us to
           the palace" [syn: take, direct, conduct, guide]
      2: result in; "The water left a mark on the silk dress"; "Her
         blood left a stain on the napkin" [syn: leave, result]
      3: tend to or result in; "This remark lead to further arguments
         among the guests"
      4: travel in front of; go in advance of others; "The procession
         was headed by John" [syn: head]
      5: cause to undertake a certain action; "Her greed led her to
         forge the checks"
      6: stretch out over a distance, space, time, or scope; run or
         extend between two points or beyond a certain point;
         "Service runs all the way to Cranbury"; "His knowledge
         doesn't go very far"; "My memory extends back to my fourth
         year of life"; "The facts extend beyond a consideration of
         her personal assets" [syn: run, go, pass, extend]
      7: be in charge of; "Who is heading this project?" [syn: head]
      8: be ahead of others; be the first; "she topped her class
         every year" [syn: top]
      9: be conducive to; "The use of computers in the classroom lead
         to better writing" [syn: contribute, conduce]
      10: lead, as in the performance of a composition; "conduct an
          orchestra; Bairenboim conducted the Chicago symphony for
          years" [syn: conduct, direct]
      11: pass or spend; "lead a good life"
      12: lead, extend, or afford access; "This door goes to the
          basement"; "The road runs South" [syn: go]
      13: move ahead (of others) in time or space [syn: precede]
          [ant: follow]
      14: cause something to pass or lead somewhere; "Run the wire
          behind the cabinet" [syn: run]
      15: preside over; "John moderated the discussion" [syn: moderate,
           chair]
      [also: led]


 lead
 Symbol: Pb
 Atomic number: 82
 Atomic weight: 207.19
 Heavy dull grey ductile metallic element, belongs to group 14. Used in
 building construction, lead-place accumulators, bullets and shot, and is
 part of solder, pewter, bearing metals, type metals and fusible alloys.