un·der·lay /-ˈle/
 (vt.)鋪在下麵,墊,支撐(vi.)向下延伸襯底,支撐之物,襯墊物
 Un·der·lay v. t.
 1. To lay beneath; to put under.
 2. To raise or support by something laid under; as, to underlay a cut, plate, or the like, for printing. See Underlay, n., 2.
 3. To put a tap on (a shoe). [Prov. Eng.]
 Un·der·lay, v. i. Mining To incline from the vertical; to hade; -- said of a vein, fault, or lode.
 Un·der·lay n.
 1. Mining The inclination of a vein, fault, or lode from the vertical; a hade; -- called also underlie.
 2. Print. A thickness of paper, pasteboard, or the like, placed under a cut, or stereotype plate, or under type, in the form, to bring it, or any part of it, to the proper height; also, something placed back of a part of the tympan, so as to secure the right impression.
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 underlay
      See underlie
      [also: underlaid]
 underlay
      n : a pad placed under a carpet [syn: carpet pad, rug pad, underlayment]
      v 1: raise or support (the level of printing) by inserting a
           piece of paper or cardboard under the type; "underlay
           the plate"
      2: put (something) under or beneath; "They underlaid athe
         shingles with roofing paper"
      3: provide with a base, support, lining, or backing; "underlay
         the boards with joists"
      [also: underlaid]
 underlie
      v 1: be or form the base for
      2: lie underneath
      [also: underlying, underlay, underlain]