signal for shunting forward and backward双面: two-sided; double-edged; dou ...调车: shunt; shunting信号机: annunciator; semaphore; tele ...调车信号机: shunting signal调车信号: maneuver signal; shunting 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:双面调车信号机，即可在微信中查询翻译
