signal at clear造句
例句與造句
- The train engine's driver would reply in similar fashion and, with signals at clear, they would set off in unison.
- This system is the forerunner of today's Automatic Warning System ( AWS ) and consists of an electrical system that sounded a bell in the cab as the train approached a signal at clear.
- It's difficult to find signal at clear in a sentence. 用signal at clear造句挺難的