冰桶挑战要求参与者将一桶冰水倒在自己身上。
The Ice Bucket Challenge requires that participants pour a bucket of ice water on themselves.
在过去的几年里，数学竞赛 Math Counts 增加了两个新的中学项目（国家数学俱乐部和数学视频挑战），试图使其参与者群体多样化。
In the past few years, Math Counts added two new middle school programs to try to diversify its participant pool—the National Math Club and the Math Video Challenge.
先前的一些研究表明，参与心理刺激的活动来挑战你的大脑可能会有所帮助。
Some previous studies have suggested that challenging your brain with mentally stimulating activities might help.
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