The study, reported in Circulation: Journal of the American heart Association, looked at heart risks related to three major insomnia symptoms compared to people who rarely or never had these problems.

这一研究发表在美国心脏学会《循环》杂志上，观察了较之从不失眠的人，三大失眠症症状患者与罹患心脏病之间的关系。

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Although the research station is far from major sources of human pollution, atmospheric circulation brings air from Europe and North America into the Arctic region.

虽然这个研究站远离人类主要的污染源，但是大气环流会把欧洲和北美的空气带到北极地区。

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Its metaphor makes West Superior ‘the center of cardiac or heart circulation’; the railways become major arteries; and New York is ‘the umbilicus through which this man of commerce was developed’.

“根据地图的十分形象的比喻， 西史匹瑞亚 是“整个心脏血液循环的中心”，铁道系统是大动脉，纽约是“商业之子起源的脐带”。”

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The Times of London still sits behind an all-but-impermeable paywall, erected a year ago, that has not only devastated web traffic but coincided with a major drop in print circulation as well.

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Meanwhile, the Post just reported one of the biggest circulation drops of any major newspaper with the lucrative Sunday edition selling 5.2% fewer copies and the daily edition skidding almost 10%.

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The classifieds business has been eviscerated by the online equivalents, display advertising is declining and so are circulations and circulation revenues: those are the three major revenue sources for a newspaper.

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