The results showed that the fracture was of typical fatigue fracture, and surface defects were the main factor resulting in the failure of the air valve spring.

结果表明，断裂呈现典型的疲劳断裂特征，材料表面缺陷是引起该弹簧疲劳断裂的主要原因。

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This was due to the difference in cerebral excitement and body fatigue resulting from a workout during different periods, they said.

研究人员指出，这是由于大脑兴奋和机体疲劳程度不同造成的。

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The failure of most valve springs is due to the applied positive stress resulting in the fatigue fracture.

多数汽门簧的失效是正应力引起的疲劳失效。

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Stress, anxiety and negative thoughts make it hard to get a good night's sleep, resulting in fatigue and lethargy.

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Although jets are pressurized so that the cabin environment resembles an altitude of around 8, 000 feet, some people report that flying (possibly from the changes in pressure and resulting decrease in oxygen concentration) causes symptoms such as headache, fatigue and nausea.

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