block signal machine闭塞: stop up; close up信号机: annunciator; semaphore; tele ...自动闭塞信号机: automatic block signal【交通】闭塞信号。: block signal闭塞信号: blocksignal; signal for blocking the track, block signal下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:闭塞信号机，即可在微信中查询翻译
