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案例一1岁的阳阳一只手拿着奶粉盒子,另一只手拎起奶粉袋子,笨拙地塞到盒子里。随后,不断地把袋子从盒子里拿出来,放进去。案例二3岁的硕硕每天晚上
Case 1 Yang Yang, a hand holding a milk powder box, the other hand picked up the milk bag, clumsily stuffed into the box. Then, keep the bag out of the box and put it in. Case two 3-year-old Shuo Shuo every night