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

细也有类似鞭子样的突出物，称为鞭毛，它们参与协助细运动。

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

与现标本样，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.

而有的细只有鞭毛。鞭毛的旋转可以推动细在水中行进。

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.

它含有毛和条像尾巴的鞭毛；鞭毛可以移动，使其能在胃肠道中移动。