澳大利亚国立大学的一项研究显示，澳大利亚的孩子和中国的孩子在入学前的视力水平相同。但是一旦他们进入小学，中国的孩子每天只会在户外度过一个小时，而澳大利亚的孩子每天在阳光下待三到四个小时。

According to a study by Australian National University, Australian children and Chinese children have the same level of eyesight before they start school, but once they enter primary school, Chinese children only spend about an hour a day outside, while Australian children spend three to four hours each day in the sunshine.

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二手烟的研究确实已经移至户外。

Studies of secondhand smoke have indeed moved outdoors.

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须考虑的是用跑步机研究不能准确反映户外的酷热环境。

One concern is that studies with treadmills may not accurately reflect what happens outside on a scorching day.

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