train signal行车: bridge crane信号机: annunciator; semaphore; tele ...调车信号机: shunting signal机车信号机: engine mans indicator; engineers indicator双面调车信号机: signal for shunting forward and backward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:行车信号机，即可在微信中查询翻译
