She's involved in many extra-curricular activities.

她参加了许多课外活动。

《牛津词典》

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。

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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。

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and they asked about my work ethic and my extra-curricular activities I did.

然后他们问我的职业道德怎么样，还有我参加过的课外活动。

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They include transport concerns over buses shared with primary schools and fears for extra-curricular activities.

BBC: Scottish Borders Council school timetable moves on hold

Others used it for books and computers or for trips and extra-curricular activities for the poorest pupils.

BBC: Pupils in playground

And I only seriously involved myself in extra-curricular activities my senior year for the sole purpose of bolstering my applications.

FORBES: Suzy Lee Weiss and the Age of Entitlement