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1·She's involved in many extra-curricular activities.

她参加了许多课外活动。《牛津词典》

2·Participating in extra-curricular activities enables us to learn to negotiate and cooperate with fellow students.

参加课外活动可以让我们学习如何与同学进行协商与合作。

3·On the one hand, participating in extra-curricular activities allows children to develop their hobbies while on the other hand, too many such activities can increase children's burden.

一方面，参加课外活动可以让学生发展自己的兴趣，而另一方面，太多的课外活动可能会增加学生的负担。

4·Learn some extra-curricular knowledge.

学习一些课外知识。

5·I have lots of extra-curricular activities.

我参加很多课外活动。

6·I have less time for extra-curricular learning.

补习后，我少了课外学习的时间。

7·I participated in several extra-curricular activities.

我参加好几个课外活动。

8·I would like to carry out extra-curricular afternoon activities.

我想天下午去进行课外活动。

9·We'll talk about extra-curricular activities, internships, and gap years.

我们会谈论课外活动，实习和学业间隙年。

10·What have you learned from participating in extra-curricular activities?

你有什么经验教训参加课外活动？

课外的

1·She's involved in many extra-curricular activities.

她参加了许多课外活动。《牛津词典》

2·Participating in extra-curricular activities enables us to learn to negotiate and cooperate with fellow students.

参加课外活动可以让我们学习如何与同学进行协商与合作。

3·We'll talk about extra-curricular activities, internships, and gap years.

我们会谈论课外活动，实习和学业间隙年。

4·I have lots of extra-curricular activities.

我参加很多课外活动。

5·On physical education and extra-curricular activities to prepare before the warming-up, attention should be paid to exercise when not to dramatic collision, so as not to be knocked down or fall.

上体育课和课外活动前要作好准备活动，运动时要注意不要剧烈碰撞，以免撞伤或摔伤。

(1)extracurricular activity课外活动