butterfly /'bAtaflai; 'bAtV/flai/ n (pl -flies) insect with four wings, often brightly coloured, and feelers. 蝴蝶。 ~ (stroke) n stroke used in swimming, both arms moving upward and outward at the same time as an up and down kick of the feet. 蝶泳 (雙腳上下踢動(dòng)時(shí), 雙臂同時(shí)向上并向外劃) 。