bidirectional operationbidirrectional operationbiplane operationboth way operationbothway operationoperation, completetwo way operationtwo-way operation雙向: two-way操作: operate; manipulate; handle半雙向操作: either-way operation雙向操作機構(gòu): double acting power unit同時雙向操作: full duplex operation; simultaneous two-way operation下載手機詞典可隨時隨地查詞查翻譯