mean stress

例句：

1. 1. The engineer calculated the meanstress in the concrete beam.
   工程师计算了混凝土梁的平均应力。
2. 2. The mean stress isa measure of the average force acting onan object.
   平均应力是作用在物体上的力的平均量度。
3. 3. Themean stress can affect thestability of the structure.
   平均应力会影响结构的稳定性。