常見例句雙語例句The utility model relates to an automatic warning device for the unmanned railway crossing, belonging to a signal device of the railway, comprising a warner, a magnetic starting device and a switch.鐵路無人看管道口自動報警裝置，屬于一種鐵路信號裝置，由報警器、磁力啟動器和開關(guān)組成。ip.com 返回 automatic starting device