also没有介词。

Too much oxygen can also block regeneration .过多的氧也可阻碍再生。

We have also tried to set an example for others .我们为求以身作则。

Our struggle also had its dark side .我们的这场斗争也有它的阴暗面。

He also can muster courage and resist .他也会鼓起勇气，进行抵抗的。