quad /ˈkwɑd/
  線組
  quad
  四線組; 四心線; 四芯( 導 )線; 四元組; 四倍的; 四個一組的
  quad
  四
  Quad Quade, a.  Evil; bad; baffling; as, a quade wind. [Obs.]
     Sooth play, quad play, as the Fleming saith.   --Chaucer.
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  Quad, n. Arch. A quadrangle; hence, a prison. [Cant or Slang]
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  quad
       n 1: one of four children born at the same time from the same
            pregnancy [syn: quadruplet]
       2: a muscle of the thigh that extends the leg [syn: quadriceps,
           quadriceps femoris, musculus quadriceps femoris]
       3: (printing) a block of type without a raised letter; used for
          spacing between words [syn: space]
       4: a rectangular area surrounded on all sides by buildings
          [syn: quadrangle]