The prehistoric people of Asia preserved meat and fish by packing them in salt.
史前亚洲人把肉和鱼放在盐里，从而使它们得以保存。
This way local breeding stocks are preserved, meaning that fish catches should remain abundant and stable.
这样便可保护当地的繁殖种群，也就是说可维持充沛和稳定的捕获量。
We all evolved from fish, so it could be that this motivation to be in water could be something that was preserved in animals that are able to do so.
我们都是从鱼类进化而来，所以动物喜欢呆在水里这种动机可能与生俱来。
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