two-way,双向，这是一般的解释！Two-way charges for cellular phones 移动电话双向收费Three direct links(mail, air and shipping services and trade) and bilateral exchanges 直接三通与双向交流bilateral也有双向的意思！The data bus is bidirectional数据总线是双向的bidirectional,双向forward,consequent.顺向A consequent river; a consequent valley.顺向河；顺向山谷reverse,逆向.To reverse the action of an engine逆转使引擎逆向运行
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