They had negative views of effort, believing that having to work hard was a sign of low ability.

他们对努力持否定态度，认为努力学习是能力低下的表现。

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Back in the 1900s, some stop signs were yellow because it was too hard to see a red sign in a poorly lit area.

早在20世纪初，一些停车标志是黄色的，因为在光线不好的地方很难看到红色标志。

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In emerging markets one must look hard to find any sign of crisis at all.

在新兴的市场中，人们很难找到任何一点危机到来的迹象。

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Without a legal framework, telecoms operators find it hard to sign deals with payment services.

ECONOMIST: Online payments

In emerging markets one must look hard to find any sign of crisis at all.

ECONOMIST: Newspapers

The third group of symptoms relates to what has been called hyperarousal, which means an emotional, mental and physical tendency to drive one's flight-or-flight nervous system too hard, a classic sign of which is a tendency to startle too easily.

CNN: Can schoolyard bullying lead to PTSD?