什么最危险？思想！
Water is the most harmful agent.
水是一种最有害的介质。
Rubella is most harmful to pregnant women.
风疹对孕妇危害最大。
It is most harmful to breathe in such polluted air.
吸入这种污染的空气是十分有害的。
Although some illegal drugs are extremely dangerous to some people, most are not especially harmful.
尽管非法的药品对一些人来说是很危险的，但是大部分并不特别有害。
Most people know that cigarette smoking is harmful to their health.
大多数人都知道吸烟有害健康。
Heart disease is one of the most common illnesses seriously harmful to human health.
心脏疾病是严重危害人类健康的最常见的疾病之一。
Heart disease is one of the most common illnesses seriously harmful to human health.
心脏疾病是严重危害人类健康的最常见的疾病之一。
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