Deep sleep is associated with slow brain waves, and larks spent 50% more time in such slow-wave sleep than owls did.

睡眠之深与否与慢波有关，而百灵鸟型处于慢波睡眠的时间比夜猫子型多50%甚至更多。

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But that willingness was being battered by globalization and multiculturalism and by new waves of immigrants with no deep attachments to America's national identity.

但这种意愿被全球化、多元文化、以及对美国国家认同缺乏深厚感情的新移民潮击垮了。

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In order for the tide waves to move fast enough at the equator to keep up with the moon, the ocean would have to be about 22km deep.

即使潮波在赤道上移动的速度跟得上月亮，海洋深度必须为22公里左右。

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The XPS One 27 is not just for work, but also for entertainment with its Infinity Premium speakers and Waves MaxxAudio 4 audio technology that delivers deep, rich sound, complete with an expanded stereo field.

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Apart from collecting prenatal pottery pieces (there seems to be no restriction against it), locals and tourists can enjoy a refreshing swim in the rolling, blue waves of the Black Sea -- so called for the colour of its deep waters densely populated with algae.

BBC: Crimea, the Ukraine��s odd beach paradise