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The children cannot twist the buttons by themselves, or sometimes they will twist them wrongly. This kind of button can effectively solve these problems.
In principle of the food chain (esp. pandas eat bamboo, monkeys eat bananas), it can allow children twist the buttons correctly, it will further improve childrens hands-on capacity. Thus, they will become more independent.
YanPing/lv WeiLang/Zhong QiYing/Yang QiaoQing/Yang