但是当人们在中风以后遇到语言听说困难——一种叫作失语症的毛病时，从难的级别开始，他们似乎进步得更快。

But when people have difficulty speaking and understanding language after a stroke-a condition called aphasia-they seem to improve faster when they start at a harder level.

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这组人员更常见的辩解是，科研工作是如此的困难——取样大，分析难——以至于大多数成果最终得出的结论是错误的。

The group's more general argument is that scientific research is so difficult-the sample sizes must be big and the analysis rigorous-that most research may end up being wrong.

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或者，从另一方面来说，睡眠差的人会因为一个或某个其他的易怒和难相处的原因，使他们交朋友更困难吗？

Or, on the other hand, do people who sleep poorly for one reason or another wind up irritable and difficult to deal with, making it harder to have friends?

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