以下为句子列表：
英文: It is when they are hunting as a pack that bacteria are particularly dangerous, for it is then that disease-causing microbes become powerful enough to attack living tissue and to fend off many sorts of antibiotic that would kill them individually.
中文: 病原微生物成群地攻击活体组织是尤为危险的，当针对病原微生物个体有效的抗生素面对大量的病原体的抵抗时，也会失去应有的效用。
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