慢速英语:四足鲸鱼化石现身南美洲

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fossil – n. part of an animal or plant from thousands of years ago, preserved in rock

evolution – n. the way in which living things gradually change and develop over millions of years

paleontologist – n. someone who studies fossils

hooves – n. the hard parts on the bottom of the feet of some animals

specimen – n. an animal, plant, etc. that is used as an example of its type, especially for scientific study

tail – n. the long, narrow part that extends from the back of an animal's body