participate in 参加
例句:
Join community or social groups and participate in their discussions and activities.
加入社团或者社会组织，并参加他们的讨论和活动。
join 连接;接合;联结;结合;联合;汇合;成为…的一员;参加;加入
例句:
I motioned him to join us
我示意他加入到我们的队伍中来。
There are any amount of clubs you could join.
有无数个俱乐部你可以加入。
join in 加入，参加（活动）
例句：
We're going to play football. Do you want to join in?
我们去踢足球，你来不来？
take part in 参加，参与
例句：
They returned to take part in the season's opening game.
他们回来参加本赛季的开幕赛。
attend 出席;参加
例句：
The meeting will be attended by finance ministers from many countries
很多国家的财政部长将出席会议。
