Scientists found ACE enzyme activity was reduced by 18 percent three hours after the cocoa dose.

科学家们发现，一种叫做血管紧张素转换酶的酶类活性在志愿者服用可可三小时后降低了18%。

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Police apprehended the suspect early Thursday as he tried to escape from the bus about three hours after the attack, Colwell said.

科尔韦尔说，警方于周四早些时候（凶杀发生后的三小时左右）在巴士上抓获了这名嫌疑犯。

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Concerns about attacks on pupils have prompted the Metropolitan Police to focus patrols on the three hours after schools shut.

对攻击学生行为的关注，已经迫使伦敦警察在学校放学后的3个小时展开巡逻。

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Faisal Shahzad was quickly identified and arrested fifty-three hours after the attempt in Times Square.

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Three hours after leaving New Guinea, Amelia sent back a radio message.

VOA: special.2010.05.26

A few hours after Brown was captured, the Governor of Virginia and three Congressmen arrived in Harpers Ferry.

VOA: special.2009.07.02

Mr. Asika was treated and released from Bellevue about three hours after the incident.

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The Airbus A330 went down about three hours after beginning what was to have been an 11-hour flight.

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Genentech's Activase, also known as tissue plasminogen activator, is approved for use only up to three hours after stroke.

FORBES: Brain Repair