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。
They must tell themselves that smoking not only does harm to their health, but also does harm to their families.
他们必须告诉自己吸烟不仅危害他们的健康，同时也危害家人的健康。
There is no doubt that an unhealthy breakfast will do harm to not only their health but also studies.
毫无疑问，一个不健康的早餐将不但对他们的健康有害，而且对学习有害。
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