Extinct but already fully marine cetaceans are known from the fossil record.
从化石记录中可以了解到一些已经灭绝、但已经完全变成海洋生物的鲸目动物。
But in fact we are a long way from being able to clone extinct animals.
但事实上，想要克隆绝种动物，我们还要很长的路程要走。
Something must be done to protect our rare wild animals from becoming extinct.
必须采取措施防止稀有动物灭绝。
Something must be done to protect our rare wild animals from becoming extinct.
必须采取措施防止稀有动物灭绝。
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