n.蝴蝶；蝶狀物；蝶泳

vt.(烹飪時把魚肉等）切開攤平

A butterfly must not be confused with a moth. 不得將蝴蝶和飛蛾混同起來。

A caterpillar is the larva of a butterfly. 毛蟲是蝴蝶的幼體。

A butterfly is flying up and down among the flowers. 有一只蝴蝶正在花叢里忽上忽下地飛著。

What are the elements of the butterfly stroke? 蝶泳的泳姿動作要領(lǐng)是什么?