They didn't have enough time to join in the activity.

他们没有足够的时间来参加这个活动。

youdao

Luckily, many volunteers from all over the world came to Qomolangma to join in the clean-up activity.

幸运的是，许多来自世界各地的志愿者来到珠穆朗玛峰参加清理活动。

youdao

Each of the students who volunteered to join in this activity got a bracelet.

每个自愿参加这个活动的学生都得到了一个手镯。

youdao

"What EU NAVFOR would like to see, and probably other commanders in the area, would be for all regional players now to take this threat seriously and all regional players in the area to join us in fighting this scourge, this criminal activity."

VOA: standard.2010.04.20

So, again, we believe that the reason we took the decision to join this coalition and engage in military activity is because there was an imminent threat -- and this is very important.

WHITEHOUSE: Press Briefing