人们一直认为，接触大自然对儿童的大脑发育是必要的。
Exposure to nature has been thought to be necessary for brain development in children.
我喜欢徒步旅行，因为这样你才可以真正接触大自然。
I love hiking because you can really get in touch with nature.
如果老年人有接触大自然的机会，生活状况会明显改善不少。
The life of old people is measurably better when they have access to nature.
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