Put them all together - knives and a chopping board used to prepare raw chicken or fish in a plastic tub with warm soapy water - and you have almost ideal conditions for the spread of bacteria.
当你把一些用具放在一起,例如用刀和砧板处理鸡肉或用它们以及装有清洁剂的桶宰鱼时,你就为细菌传播准备好了条件。
When salmon farming first started in Europe, the fish often became infested with lice, which then spread to wild fish.
当鲑鱼养殖在欧洲开始的时候,这种鱼经常伴随着虱子大量滋生,随后虱子又蔓延到野生鱼上。
Other factories have spread like wild flowers among what were once rice fields and fish farms.
大量的厂房像野花一样盛开在原来的稻田和渔场之上。
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