例句與造句

1. The engineers and conductors must keep in constant contact with each other, particularly as trains approach rail crossings.
2. To address the hazard, Congress passed a law in 1994 mandating that trains toot their horns as they approach rail crossings.
3. Trouble was experienced with the mixed gauge points, and some were converted to a type where the approach rails were shifted to meet the lead rails, so that there were no switch rails at all.
4. It's difficult to find approach rail in a sentence. 用approach rail造句挺難的