Experiments have also cast serious doubt on the belief that yawning is triggered by a drop in blood oxygen or a rise in blood carbon dioxide.

对于打哈欠是由血液中的氧气减少或血液中的二氧化碳增加引起的这种观点，一些实验也同样提出了严重的质疑。

youdao

Research on sleep deprivation suggests that the IQ drop caused by electronic obsession is also equivalent to a wakeful night.

关于剥夺睡眠的研究表明因为痴迷于电子产品而造成的智力衰退相当于一夜失眠。

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By focusing on the doing, we drop our worries and anxieties, jealousies and anger, grieving and distraction.

把精力集中在所做的事情上，我们就会忘记担心和焦虑，忘记嫉妒和愤怒，忘记悲伤和困惑。

youdao

As the weekend went on, the miracles kept coming the kindness of the scattered police, the 'food-drop' by an Army helicopter, and flowers from the sky.

VOA: special.2009.08.10

Cuba still imports some food from the United States, but the country is short on cash for a number of reasons including the damage done by hurricanes and a drop in tourism revenue.

VOA: standard.2010.07.29

Drop by on a colleague outside your immediate department.

FORBES: Career Management In 5 Minutes A Day

Pace registered the biggest drop by far on the London Stock Exchange in early trading.

BBC: Pace shares fall 40% on profit warning linked to Japan

The snowy, windy system that bore down on the Northeast on Friday was expected to drop 8 to 16 inches on the areas hardest hit by Sandy, a swath including New Jersey, New York City, Long Island and Connecticut.

WSJ: Sandy in back of Easterners' minds as snow falls