这是一支神奇的笔，趴着写字，笔头即缩回，坐正写字，笔头又跑出来，有效矫正孩子不良坐姿，防近视，防驼背哦，活动期间买一送一，要买的找 。
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这是一支神奇的笔，趴着写字，笔头即缩回，坐正写字，笔头又跑出来，有效矫正孩子不良坐姿，防近视，防驼背哦，活动期间买一送一，要买的找 。