他在课外时间学习了编程。

He learned programming in his extracurricular time.

当然，双胞胎会在课外时间和晚上离开格兰芬多塔楼时使用地图。

In the nature of things, the twins would be using the Map outside class hours, at night, while sneaking around outside Gryffindor Tower.

在校期间参加了交谊舞社团等,丰富课外时间同时增强了自身社交礼仪的培养.

I have joined the dancing mass organization which cultivated the social intercourse and etiquette.