be covered with 与be covered by的区别是什么?

be covered with 与 be covered by 有什么不同? be covered with 与be covered by的区别是什么? 用be covered with造句 A be covered with B be covered in 和be covered with 有什么区别? be covered with .be covered by 的区别? be covered with和be covered by有什么区别? be covered with 和 be covered under 有什么区别? Be covered be covered be covered be covered with 和be covered by 的区别,请造句哇 be covered with 和be covered by 可否通用?都是表示“用.覆盖,被.覆盖,由. cover with和be covered with有什么区别 In 1620,about half the USA was covered by forests.此句子对吗?将by换成with行吗?我看到别处有用with的.可是be covered with 与be covered by不能通用,有点晕. be covered in/with/by有什么区别? be covered by/with有什么区别?怎么用? be covered by/with有什么区别?怎么用?