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随便看	bi-direction transceiver bi-direction transmission bidirection triggering Bi-direction valve bi-direction variable-tension control bi-direction zero-leakage bi-direetional DC/DC Bi-direetional servo brake bidireetion association Bidirel bidiretional mapping bidirgiu bidirrectional bus bidirrectional bus driver bidirrectional clamping circuit bidirrectional clipping circuit bidirrectional counter bidirrectional operation bidirrectional printer bidirrectional transducer bidirrectional transistor bidirrectional triode thyristor bidis bidiscoidal bidiscoidalis