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针对部分小学经济能力有限的现状,笔者通过多年的尝试和摸索,发明了一种简易拉力器,以下即是该器材的制作与使用方法。
In view of the limited economic status of some primary schools, the author invented a simple Rally through many years of trial and error. The following is the method of making and using the equipment.