Fish can not live without water.

鱼儿离不开水。

《新英汉大辞典》

This group of complex animals, which includes fish, birds, reptiles and mammals (like us humans) have highly specialised immune systems, which should not let these foreign organisms live in our cells.

这种复杂动物，包括鱼类、鸟类、爬行动物和哺乳动物(如我们人类)，具有高度细化的免疫系统，这样的系统不会允许这些外来生物体在我们的细胞中生长。

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Fish can not live out of water.

鱼脱离了水就不能活。

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