/ˈbʌtəflaɪ ||; ˈbʌtɚˌflaɪ/noun1 [C] (plural butterflies) an insect with a long, thin body and four brightly coloured wings 蝴蝶: Caterpillars develop into butterflies. 毛虫蜕变为蝴蝶。 ☞picture at insect 见 insect 插图
2 [U] a style of swimming in which both arms are brought over the head at the same time, and the legs move up and down together 蝶泳;蝶式
have butterflies (in your stomach)(
informal 非正式) to feel very nervous before doing sth 行动之前忐忑不安