un. 周期 [网络] 回路周期;回圈周期 closed loop;closed cycle: 闭环steam cycle power loop: 蒸汽循环动力回路phase lock loop cycle slipping: 锁相环周期滑动ring opening; open loop; open cycle: 开环be in the loop: 在一个圈子下载手机词典可随时随地查词查翻译