我想知道"join"与"join in''的区别和各自的用法.

I will only join the team if you xxxx

Join the two sticks together with glue xxxxx

Join in - to specifically indicate what you are mentioning..

sorry if i'm sounding a bit vague

join in一般后面是接比赛、活动之类的，如：
I want to join in the writing competition.我想参加写作比赛。
join可以是加入组织、讨论之类的，也可接人做宾语，如：
We are having a discussion about cultural relics.Will you join us?
我们正在讨论关于文物的话题，你要加入我们么？

no,i can't

bu hui