其实，人体就是一个活生生的例子。通常大家都认为细菌是有害的，孰不知人体如果没有了细菌，人是无法存活的。
【正确答案】：It is generally believed that viruses are harmful, but scarcely does it come into our mind that a person cannot survive without them.
【题目解析】：否定副词scarcely在句首，后面要倒装。这里我们把“孰不知”翻译成“scarcely does it come into our mind that”。
