New words：

tadpole ['tædpəul] n.蝌蚪

Sample Sentences：

Both fish and tadpoles have gills.
Now it is no more a tadpole; it has become a young frog.
Each tadpole has a mouth with tiny teeth to gnaw the plants.

gill [gil] n. 鳃
gnaw [nɔ:] v. 啃；咬；啮；侵蚀

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