自然野生动物联合会(一个倡导性的组织)建议每天尽量让孩子在大自然中自由玩耍一个小时。

Each day, try giving kids one hour of unstructured play in the natural world, suggests the National Wildlife Federation, an advocacy group.

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孩子还是应该去鼓励在不干净的环境中玩耍。

Children rather should be encouraged to play in the dirt.

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我作了自我介绍，她紧紧拥抱着我，向我展示出她童年时的照片：与宠物玩耍、在吊床中摆手、一个总想试图站立的孩子，她脸上充满着甜蜜的微笑。

I introduced myself, and before I knew it, her arms were around me. She brought a box full of pictures of herself as a child -- playing with a pet, swinging in a hammock.

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