to cut down trees is harmful to human beings.同义句转换 it's— —human beings — —- —trees.
问题描述：
to cut down trees is harmful to human beings.同义句转换 it's— —human beings — —- —trees.
答
以下两种答案均可：
1. It's (bad for) human beings (to cut down) trees.
2. It's (harmful to) human beings (to cut down) trees.
建议楼主采用第一种.
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