flipper ['flɪpə(r)]

以下由轻松背单词网站提供

附加级

n. 鳍状肢，潜水用橡皮制鳍状肢

The seal's flipper is homologous with the human arm. 海豹的鳍肢与人类的手臂同源。
It's almost like a flipper action as she kicks down. 她向下踢腿时有鱼鳍的效果。