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.

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。

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Three to four hours.

三到四小时。

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They normally build one made of snow, for survival courses, within three to four hours.

在锻炼生存能力的课堂上，他们通常在三四个小时内就能搭建出一座雪屋。

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"Now we have what we would call rush hour conditions or peak travel conditions for as much as eight hours during the day - about three to four hours in the morning and similar time in the evening."

VOA: standard.2010.07.26

We practice six days a week, usually, you know, three to four hours a day,

通常我们每周练习六天，你知道，每天三到四个小时，

赛艇项目很流行 - SpeakingMax英语口语达人

But recent findings suggested that tPA may be effective in saving brain tissue even if three to four and a half hours have passed.

VOA: special.2009.09.22

It took the in-house gem-setter three to four hours a day for several days to complete the pattern.

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The place is a treasure trove of world tunes that deserves at least three to four hours to fully appreciate.

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Many fans are drinking from three to four hours before the game starts until two hours after the game ends.

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