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。

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Armor C12 convertible notebook has a die-cast magnesium alloy case, and has been tested for drop-shock, moisture, temperature extremes, and resistance to dust and vibration.

ArmorC12 convertible笔记本电脑具有印模压铸的镁合金外壳，已经通过了跌落冲击、潮湿、极端温度与防尘和抗振动测试。

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Drag and drop spell icon to cast a spell.

拖放法术图标施放一个法术。

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However, those of a romantic cast of mind cannot help wondering where the boats go after they drop off the tourists, chugging upriver and out of sight.

BBC: Take the boat out of Bangkok

The number of electors could drop to 115, as two cardinals will turn 80 in March, when their age makes them ineligible to cast a vote.

CNN: February 12, 2013 -- Updated 2035 GMT (0435 HKT)