问题描述：
求翻译：have you thought that sometimes,in some places,
have you thought that sometimes,in some places, our feet may have a bad effect on environment ?
rivers and lakes used to be clean, but now they are badly polluted. Even some high trees have boring plastic garbage bags hanging on them. Now it is clear .
have you thought that sometimes,in some places, our feet may have a bad effect on environment ?
rivers and lakes used to be clean, but now they are badly polluted. Even some high trees have boring plastic garbage bags hanging on them. Now it is clear .
问题解答：
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