al·ter·nate /ˈɔltɚ/
 (a.)交互的,輪流的(vt.)(vi.)輪流,(使)交替


 alternate
 替用路徑


 alternate
 交替; 替代


 alternate
 替用 交替


 Al·ter·nate a.
 1. Being or succeeding by turns; one following the other in succession of time or place; by turns first one and then the other; hence, reciprocal.
    And bid alternate passions fall and rise.   --Pope.
 2. Designating the members in a series, which regularly intervene between the members of another series, as the odd or even numbers of the numerals; every other; every second; as, the alternate members 1, 3, 5, 7, etc. ; read every alternate line.
 3. Bot. Distributed, as leaves, singly at different heights of the stem, and at equal intervals as respects angular divergence.
 Alternate alligation. See Alligation.
 Alternate angles Geom., the internal and angles made by two lines with a third, on opposite sides of it. It the parallels AB, CD, are cut by the line EF, the angles AGH, GHD, as also the angles BGH and GHC, are called alternate angles.
 Alternate generation. Biol. See under Generation.


 Al·ter·nate n.
 1. That which alternates with something else; vicissitude. [R.]
    Grateful alternates of substantial.   --Prior.
 2. A substitute; one designated to take the place of another, if necessary, in performing some duty.
 3. Math. A proportion derived from another proportion by interchanging the means.


 Al·ter·nate v. t. [imp. & p. p. Alternated; p. pr. & vb. n. Alternating.]  To perform by turns, or in succession; to cause to succeed by turns; to interchange regularly.
    The most high God, in all things appertaining unto this life, for sundry wise ends alternates the disposition of good and evil.   --Grew.


 Al·ter·nate, v. i.
 1. To happen, succeed, or act by turns; to follow reciprocally in place or time; -- followed by with; as, the flood and ebb tides alternate with each other.
    Rage, shame, and grief alternate in his breast.   --J. Philips.
    Different species alternating with each other.   --Kirwan.
 2. To vary by turns; as, the land alternates between rocky hills and sandy plains.

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 alternate
      adj 1: every second one of a series; "the cleaning lady comes on
             alternate Wednesdays"; "jam every other day"- the
             White Queen [syn: alternate(a)]
      2: allowing a choice; "an alternative plan" [syn: alternative]
      3: occurring by turns; first one and then the other;
         "alternating feelings of love and hate" [syn: alternate(a),
          alternating(a)]
      4: of leaves and branches etc; first on one side and then on
         the other in two ranks along an axis; not paired; "stems
         with alternate leaves" [ant: opposite]
      n : someone who takes the place of another person [syn: surrogate,
           replacement]
      v 1: go back and forth; swing back and forth between two states
           or conditions [syn: jump]
      2: exchange people temporarily to fulfill certain jobs and
         functions
      3: be an understudy or alternate for a role [syn: understudy]
      4: reverse (a direction, attitude, or course of action) [syn: interchange,
          tack, switch, flip, flip-flop]
      5: do something in turns; "We take turns on the night shift"
         [syn: take turns]