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。
"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。
"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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