Definition
- B1
to take part in an activity alongside others
加入；参与
The children were all playing a game, and Mary wanted to join in.
孩子们都在玩游戏，玛丽想加入。
If you are interested, feel free to join in our discussion at any time.
如果你有兴趣，随时可以加入我们的讨论。
We hope more people will join in during this event.
我们希望有更多人在这次活动中参与进来。