As a group, they are much tougher than many bigger animals that we know well such as birds and fish, cats and dogs.

相对于我们所熟知的许多更大的动物比如鸟类、鱼类、猫和狗来说，它们的的群体更加顽强。

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As a group, they are much tougher than many bigger animals that we know well such as birds and fish, cats and dogs.

相对于我们所熟知的许多更大的动物比如鸟类、鱼类、猫和狗来说，它们的的群体更加顽强。

youdao