A study in Sweden indicated that kindergarten children who could play in a natural environment had less illness and greater physical ability than children used only to a normal playground.
瑞典的一项研究表明，能够在自然环境中玩耍的幼儿园儿童比只能在普通操场上玩耍的儿童患病更少，体能更强。
It is unnecessary to maintain in natural environment and normal situation.
当在正常的环境和情况使用时，是不需要保养的。
At the Night Safari , you can watch these animals in a more natural environment than a normal zoo.
在夜间野生动物园，你会看到这些动物比普通动物园的动物处于一个更自然化的环境。
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