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每逢双休日,儿子都要去学趣味数学课,那是一种数学思维训练课。那些稀奇古怪的数学题有点像脑筋急转弯,答案总是出人意料。
Every weekend, my son has to learn fun math class, it is a mathematical thinking training class. Those bizarre math problems a bit like Riddles, the answer is always unexpected.