moving in two different directions; allowing something to move in two different directions 雙行的;雙向的 two-way traffic 雙向交通 two-way trade 雙向貿易 a two-way switch (= that allows electric current to be turned on or off from either of two points) 雙路開關
(of communication between people )人際交流 needing equal effort from both people or groups involved 相互的;彼此的;有來有往的 (of radio equipment, etc. )無線電設備等 used both for sending and receiving signals 收發兩用的 a two-way radio 雙向無線電(收發兩用)