压力一般来自两个方面：体力活动及精神或情感活动。

Stress comes from two basic sources: physical activity and mental or emotional activity.

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优化的保压压力一般为最低保压压力和最高保压压力的中间值。

The optimized holding pressure is in the middle of the maximum and minimum normally.

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然而，肺部的压力以及一般的疲劳会阻止你通过摄取足够的食物来跟上你的能量需求。

However, pressure from your lungs on your stomach and general tiredness may keep you from eating enough to keep up with your energy needs.

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If you experience a lot of stress in high school and elementary school and were unhappy, generally the best predictor would say that you would feel the same way a month into your Harvard experience.

如果你在高中,初中时经历过很大压力而且不快乐，一般来说最好的预言家会说,在哈佛呆上一个月，你会有同样的感觉。

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