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学生课桌大部分是固定的,不是太高就是太低,很多学生上课时坐着感到很不舒服。我想发明一种可以调节高低的学生课桌。如果你觉得桌子太
Most students desk is fixed, not too high or too low, many students feel very uncomfortable sitting in class. I want to invent a desk that can regulate the level of students. If you think the table too