Kitty and Dad worked for three hours before Mum came back.

在妈妈回来之前，凯蒂和爸爸忙活了三个小时。

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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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The decision came less than three hours before the mandate was to expire.

这一决定是在授权满期前不到三个小时的时候作出的。

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At Fort Sumter, Major Robert Anderson and his men waited three hours before firing back at the Confederate guns.

VOA: special.2009.08.13

"Three or four hours before I could fall asleep. I wake up three o'clock in the morning with the same stuff on my mind, tossing and turning.

VOA: standard.2010.05.04

He has been in many productions in Australia, Europe and the U.S. He has sung Escamillo in "Carmen" before, most notably in 2010, when he was called to fill in for a singer three hours before a global broadcast of a Metropolitan Opera performance.

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It is the last one he writes just three hours before his execution by the Nazis.

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She held onto a branch in the water for three hours before help arrived, she said.

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