As the researchers explain, current methods to fabricate high-quality graphene fall into two categories: mechanical approaches and chemical approaches.

正如研究人员解释的那样，当前制备高质量石墨烯的方法分为两类：机械法与化学法。

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While it may come as no surprise that genes may help explain why some people have many friends and others have few, the researchers said, their findings go just a little farther than that.

研究人员称，用基因解释为什么有些人朋友众多而有些人却寡朋少友其实并不新鲜，不过他们的研究更深入一些。

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But that can't explain what researchers at Dartmouth have discovered: Medicare spends twice as much on similar patients in some parts of the country as in others.

但这并不能解释达特茅斯的研究人员所发现的问题：同样的病症，该国某些地方的医保费用是其他地方的两倍。

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Various factors, such as obesity, hypertension and glucose levels, may be linked to poor sleep and explain the stroke findings, researchers said.

WSJ: Even Outdoors, Second-Hand Smoke Affects Non-Smokers