我在心里做了一个实际的危害分析。
It does not appear that volunteering for self-serving reasons does actual harm, and it can still do your community good.
这并不表示为了自身利益而帮助他人是有害的,这么做还是可以造福你的社区。
Some of the contents of this gas, such as lead, not only pollute the atmosphere but cause actual harm to the health of people.
这种气体中的某些成分,比如铅,不仅污染大气,而且对人类身体健康也确实产生害处。
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