join in后加什么？

Now and again he'd join in when we were playing video games.

我们玩电子游戏时，他偶尔会和我们一起玩。

No matter how often they were urged, they could not bring themselves to join in

就算别人说破了嘴皮，他们就是不加入。

The main rebel groups have agreed to join in a meeting to set up a transitional government.

主要叛乱集团已同意参加会议讨论建立一个过渡政府。

I didn't want to join in, but Kenneth insisted.

我不想加入，但是肯尼思非要坚持。

When one starts singing, all the others join in.

一唱百和。