They have a whiplike structure called a flagellum 它们有像鞭子一样鞭毛结构。
2.
Flagellum ( pl . flagella ) a whiplike extension of prokaryote cells , with a basal body at its base , whose beat causes locomotion of the cell 鞭毛：原核细胞的鞭状延长部分，基部有基体，当鞭毛进行挥鞭式运动时可以促使细胞移动。
