例句與造句

1. On the roof are found scissor ( double-arm ) pantographs of the type DBS 54a, standardized for all " Einheits " classes, mounted on the obligatory roof insulators, as well as the compressed air main switch and the current-to-voltage converter for the monitoring of the overhead wire voltage.
2. It's difficult to find compressed air main in a sentence. 用compressed air main造句挺難的