They have a whiplike structure called a flagellum.

它们有像鞭子一样鞭毛结构。

BIOLOGY: Certain bacteria propel themselves using a flagellum, a whiplike tail.

生物学：有些细菌会以鞭毛(像鞭子一样的尾巴)驱动自己前进。

Certain eukaryotic cells can swim freely in liquid environments, propelled by whiplike cilia or flagella.

某些原核细胞能够在液体环境中自由游动，由鞭子似的纤毛和鞭毛推进。

Flagellum (pl. flagella) A whiplike extension of prokaryote cells, with a basal body at its base, whose beat causes locomotion of the cell.

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。