light concrete造句

例句与造句

1. Recently they had learned to cast light concrete boats
   最近他们学会了浇铸轻型水泥船。
2. Recently they had learned to cast light concrete boats
   最近他们已学会了浇铸轻型水泥船。
3. It's difficult to find light concrete in a sentence. 用light concrete造句挺难的