压力产生的原因在第三章就已经论述过了。
The causes of stress have already been discussed in Chapter 3.
从项目管理的角度分析了压力产生的原因和效果，并探讨了减轻压力的管理办法。
This paper analyzes on the reasons and the effects of the generation of the pressures from the Angle of the project management, and probes into the method for the management related to the pressures.
从相对平衡的角度分析了刚体定轴转动轴上附加压力产生的原因以及实现自由转动的条件。
From the Angle of relative equilibrium, the paper analysis the reason of the formation of the additional pressure on the axis of fixed-point rotation of rigid body.
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