You'll have to be quick. The flight leaves in about three hours.

你得快点了，那个航班大约3小时后就起飞了。

《柯林斯英汉双解大词典》

The Chunnel enables you to travel by train from Paris to Landon in about three hours.

海底隧道使你能够乘火车去旅游从巴黎到伦敦只需三个小时。

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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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President Obama and 18 members of his national security team spent about three hours in the White House Situation Room Wednesday, assessing their Afghanistan policy.

VOA: standard.2009.10.01

"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

NPR's Don Gonyea joins us from Springfield, Illinois, where there's going to be a rally in about three hours for the Democratic ticket.

NPR: Obama Selects Biden For Democratic Ticket

The device contains a lithium battery pack that charges to the max in about three hours (my only complaint), giving your iPhone 4 another six hours of talk time.

ENGADGET: IRL: Rayovac Mobile Power Pack, a TomTom car charger and cleaning a DSLR sensor

The device will run for about three hours in XP mode and 8-12 hours as a smartphone, and is targeted at execs and salespeople who want to travel light.

ENGADGET: DualCor cPC merges XP PC with smartphone