Most bullying is found in schools where there is a tarmac playground; the least bullying is in a natural area that the children are encouraged to explore.

大多数欺凌行为发生在有柏油操场的学校；欺凌行为发生最少的地方在鼓励儿童去探索的自然区域。

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In the Twin Cities' natural area, the morning could be very busy.

在双子城的自然区域，早晨可能会非常繁忙。

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In the unheated natural area, sagebrush is a source of moisture for an army of thirsty insects.

在没有加热的自然区域，山艾树是很多昆虫的水源。

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The Forest Service is protecting the area from too much human activity so it will return to its natural wild condition.

VOA: special.2009.07.20

"For certain species, the city is as good as or better than a natural area, " Mr. Ascher said.

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An ideal garden for bees has plenty of nooks and untidy natural area providing places to hibernate and make their home.

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Fieldston is part of Riverdale's Special Natural Area District, which seeks to preserve the region's natural topography, including its sloping hills and rock formations.

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