“砾石”怎么读？

“砾石”的英语可以翻译为：gravel，grail，dirt ...

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....