双向继电器relay: n. 1.接替的马;驿马;接替的狗;(备有接替马匹的)旅 ...bidirectional: 双方向的; 双向的; 双向性的,8字型指向的; 双指向性backward and bidirectional: 反向与双向的bidirectional algorithm: 双向算法bidirectional amplification: 双向放大下载手机词典可随时随地查词查翻译