un·der·laid /ˌʌndɚ/
 underlay過去式和過去分詞
 Un·der·laid a. Laid or placed underneath; also, having something laid or lying underneath.
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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]
 underlaid
      See underlay