While most E.coli bacteria are harmless, a group called enterohaemorrhagic E. coli (EHEC) can produce toxins, known as Shiga toxins or verotoxins, which damage blood cells and the kidneys.

虽然大多数大肠杆菌无害，但肠出血性大肠杆菌(EHEC)可以产生破坏血细胞和肾脏的志贺毒素或维罗毒素。

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"Butterflies are fragile, beautiful and harmless - a symbol of freedom," he says, gaining momentum.

“蝴蝶是脆弱、美丽，和无害的生物——它是自由的象征，”他说着，越来越兴奋起来。

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So,I said to myself, it would be a simple, harmless act to help him as much as I could.

VOA: special.2010.03.27

Socrates is not harmless because of his own professed ability to attract followers, a few today, a few more tomorrow.

苏格拉底并非无害,因为他擅长吸引信徒的能耐,今天几个，明天再几个。

耶鲁公开课 - 政治哲学导论课程节选

The Athenians refuse to tolerate Socrates because they know he is not harmless, that he poses a challenge, a fundamental challenge to their way of life and all that they hold to be noble and worthwhile.

雅典人拒绝容忍苏格拉底,因为他们明白他并非无害，他公然挑衅，社会本质的生活方式,及他们视为崇高及值得的观念。

耶鲁公开课 - 政治哲学导论课程节选

They know a G film is harmless and a PG almost certainly is, and a PG-13 may or may not be.

WSJ: Roger Ebert on Movie Ratings

One they can turn a seemingly harmless substance into a weapon they try to figure out a safer substitute.

FORBES: Young Juvenile Makes An Explosive With Baby Powder And Other Tales From The URI Explosives Lab

It may be surprising to see management as a social grace, but fulfilling the burning need to exercise power in a relatively harmless manner provides a useful social service.

ECONOMIST: The 20th century