They can also have flagella which are long, whip-like protrusions that allow the bacteria to move.

表面有似鞭子一样的突出物，称为鞭毛，它们参与协助运动。

As in modern specimens, the fossil sperm lacked a flagellum, or tail.

与现标本一样，化石精子没有鞭毛或尾巴。

Others have only one flagellum. The flagella rotate, pushing the bacteria through the water.

而有的有一根鞭毛。鞭毛的旋转可以推动在水中行进。

It has pili and a single polar flagellum, kind of like a tail, at one end which it uses for movement through the gastrointestinal tract.

它含有毛和一条像尾巴的鞭毛；鞭毛可以移动，使其能在胃肠道中移动。