1·You may be the only younger one in your year, but, you know, we have a lot of after-school activities you can join in.
你可能是你们年级里唯一一个比较年轻的孩子，但是，你知道，我们有很多课外活动，你也可以参加。
2·I should join in more activities.
我应该参加更多活动。
3·Which club will the woman probably join in?
这位女士可能会参加哪个俱乐部？
4·More than 800 students wished to join in this test, and 400 were chosen.
有800多名学生希望参加这次测试，其中400人被选中。
5·As a result, many primary schools, especially those in big cities, do not let students join in outdoor activities during breaks, fearing that they might get hurt.
因此，许多小学，特别是那些大城市的，不让学生在休息期间参加户外活动，担心他们可能会受伤。
1·I want to join in their adventures.
我想要加入他们的冒险。
2·Should South Africa join in this group?
南非该加入这一集团吗？
3·Then they can post "open lunch" events to invite others to join in.
然后他们可以发布“开放午餐”活动来邀请其他人加入。
4·If more people join in the trend to ride bicycles to work then the air quality will be improved notably.
如果更多的人加入骑自行车上班的行列，那么空气质量将明显改善。
5·The moment the children tried to join in they had to play by themselves, for the mermaids immediately disappeared.
孩子们一想加入，他们就只得自己玩了，因为美人鱼们马上就不见了。