学生们参加课外俱乐部、夏令营、在线论坛和课程，以及基于大学的“数学圈子”，来为比赛做准备。

Students attend after-school clubs, summer camps, online forums and classes, and university-based "math circles", to prepare for the competitions.

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很多孩子都参加了课外俱乐部。

Most children take part in after-school clubs.

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去年他成立了一个课外俱乐部来探索中国古代的科学。

Last year he started an after-school club to explore science in China's past.

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