问题描述：
be covered with 和be covered by 的区别
the wall seem to be covered witn the skin of a fish
it looks as if the stadium is covered by a gray net of steel
分析一下这两句
the wall seem to be covered witn the skin of a fish
it looks as if the stadium is covered by a gray net of steel
分析一下这两句
问题解答：
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