“砾石”造句

两个小伙子正在松散的砾石路面上赛摩托车。
Two young men were racing motorcycles on the loose gravel.

需要更多的砾石来填平车道上的坑洼.
More gravel is needed to fill the hollow in the drive.

砾石常用来筑路.
Gravel is much used for road - making.