有些狼群家族只会捕猎一种动物，比如鹿，对其他动物就视而不见。
Some families can hunt only one animal for example a deer and ignore others.
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它们是动物王国里名声显赫的“三大家族”。
They are three families of great renown in the animal kingdom.
节肢动物是无脊椎动物中的大家族。
Arthropods make up a very large group of invertebrates.
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