n.蝴蝶；蝶状物；蝶泳
vt.(烹饪时把鱼肉等）切开摊平
A butterfly must not be confused with a moth. 不得将蝴蝶和飞蛾混同起来。
A caterpillar is the larva of a butterfly. 毛虫是蝴蝶的幼体。
A butterfly is flying up and down among the flowers. 有一只蝴蝶正在花丛里忽上忽下地飞着。
What are the elements of the butterfly stroke? 蝶泳的泳姿动作要领是什么?
