Could simply be the natural temporal variation of the stress field in the earth's lithosphere.
可能只是地球岩石圈(岩石圈是地球外部的固体部分)中应力场的自然的暂时变异。
Consequently, it is required to know the variation regularity of temperature field in the structural member and thermal stress in order to make thermal crack controlled.
为了进行裂缝控制应掌握结构温度场和温度应力的变化规律。
The strain test in the agricultural machinery field was used to probe the stress variation inside a frame in order to examine the strength of the plastics greenhouse frames.
为验证大棚骨架的强度，用农机测试中的应变测量法，来探索其内部应力的变化情况。
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