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....
Nim ruminated, digesting the information he had been given.尼姆陷入了沉思, 他在消化刚听到的这些情况.He ruminated on [ over ] what had happened the day before.他 沉思 前一天发生的事.He ruminated over the problem.他反复思考这个问题....