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

　　我們玩電子游戲時，他偶爾會和我們一起玩。

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

　　就算別人說破了嘴皮，他們就是不加入。

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

　　主要叛亂集團(tuán)已同意參加會議討論建立一個過渡政府。

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

　　我不想加入，但是肯尼思非要堅持。

　　When one starts singing, all the others join in.

　　一唱百和。