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be covered with 和be covered by 的区别,请造句哇

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be covered with 和be covered by 的区别,请造句哇
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答案和解析
be covered with 被…所覆盖,覆盖着,盖满…
The grass was covered with frost in the early morning.
The tree was covered with beautiful pink blossom.
be covered by ...:由...承担/负担/支付;被...掩护/报道/监视/控制等等,表示抽象的概念,后面接人,机构,或者组织.
These expenses are covered by the state.