switch frog造句

例句与造句

1. The locomotives so configured also had more difficulty staying on the rails in reverse, particularly through yard trackwork like switch frogs . )"
2. The overhead for the entire Highland Branch was modified to handle both trolley poles and pantographs, with short runners installed at each switch frog to guide the pantographs past.
3. A centennial historic plaque from 1926, an original switch frog, a piece of train track, and a section of superstructure from the Granite Railway are in the gardens on top of the Southeast Expressway ( Interstate 93 ) as it passes under East Milton Square.
4. It's difficult to find switch frog in a sentence. 用switch frog造句挺难的