Extracurricular activity.
课外科研活动
No, we have an extracurricular activity this afternoon.
没有，下午课外活动。
What extracurricular activity is most important to you?
哪种课外活动对你最为重要？
participation in theatrical productions as an extracurricular activity.
作为课外活动的戏剧演出。
The extracurricular technological activity for college students is an effective combination between theory and practice.
大学生课外科技活动是理论和实践的有效结合。
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