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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Eddie Bernard: And first instrumented deep ocean buoy we have had arrived at that location about three hours after the tsunami was generated.

艾迪·伯纳德：海啸发生3小后我们的第一个深海浮标就测得了其位置。

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

VOA: special.2010.05.08

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

VOA: special.2009.07.02

But experts generally advise against using the drug if more than three hours have passed after the first signs of a stroke.

VOA: special.2009.09.22

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

WSJ: Nine Injured Bystanders Are Expected to Survive

Some three hours after the accident, fire department sources said rescue operations had ceased, with ongoing work focusing on recovery.

CNN: Six killed in Washington-area Metro train collision

Three hours after the blasts, Iraqi military helicopters were still hovering over the Justice Ministry as the sounds of sirens wailed.

CNN: STORY HIGHLIGHTS