One is called the S-N curve of surface fracture mode. It is governed by a crystal slip on the specimen surface, which occurs in the region of short fatigue life and high stress amplitude level.

一组叫做表面破坏模式的S-N曲线，它发生在高应力幅短寿命区，是由试样表面晶体滑移引起的。

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Lynda Spain, a stress management consultant in Manchester, agrees that it's important to identify someone's stress level.

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All the data are run through software that can gauge the driver's overall stress level.

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"There's a high level of stress that youth face in the transition from youth to adulthood, " Charles Robbins, executive director of The Trevor Project, said.

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