quadruplex
  四工
  quadruplex
  四工的; 四重的; 四倍的; 四路多工的	QUAD
  quadruplex
  四工
  Quad·ru·plex a.  Fourfold; folded or doubled twice.
  Quadruplex system Electric Telegraph, a system by which four messages, two in each direction, may be sent simultaneously over the wire.
  ◄ ►
  quadruplex
       adj : having four units or components; "quadruple rhythm has four
             beats per measure"; "quadruplex wire" [syn: quadruple,
              quadruplicate, fourfold]