According to this view, zero stress makes us happy and healthy. Wrong.
按这个观点，零压力就能让我们开心健康，错！
Locate the point of zero stress.
定出应力为零的部位。
The bending stress is zero for the element at b.
在B处的单元体，弯曲应力为零。
At that time, the slope of stress-strain curve of the rock is zero.
此时岩体应力—应变曲线的斜率为零。
At that time, the slope of stress-strain curve of the rock is zero.
此时岩体应力—应变曲线的斜率为零。
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