今年是世界自然基金会第四次举办“地球一小时”活动。

This year's was the fourth annual Earth Hour, organized by the World Wildlife Fund .

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那天早晨，3名炸弹人分别在三列不同的伦敦地下铁列车上引爆了自己，紧接着一小时后，在塔维斯托克站的一座双层巴士上发生了第四次爆炸性袭击事件。

That morning, three bombers detonated themselves in three of London'sUnderground trains, before a fourth explosion occurred on adouble-decker bus in Tavistock Square an hour later.

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根据病人状况，生命体征通常每小时记录一次或一小时记录四次。

Vital signs are usually recorded from once hourly to four times hourly, as required by a person's condition.

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将会有四次各一小时的随堂考，在复习课中举行。

There will be four one-hour quizzes. They will each take place during a recitation section.

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将会有四次各一小时的随堂考，在复习课中举行。

There will be four one-hour quizzes. They will each take place during a recitation section.

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