Jean Piaget noticed how one child solved the problem of opening the lid of a box only when it opened its mouth.

让•皮亚杰留意过一个孩子是怎样将开了一道口的盒子打开的。

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Jean Piaget noticed how one child solved the problem of opening the lid of a box only when it opened its mouth.

让•皮亚杰留意过一个孩子是怎样将开了一道口的盒子打开的。

youdao