低差 meaning in Chinese

undershoot

It is found that cyclic loading at high differential stress level will lead to the decrease of felicity ratio , and the value max can be decreased by some crack systems in specimen . there is still a lot of ae during unloading at high differential stress level , which implies that the deformation is dominated by fracturing at low differential stress level , and the deformation by frictional sliding increases greatly at high differential stress level
关于应力方式对岩石破裂的影响，发现较高差应力水平下的多次循环加卸载会使felicity比减小；某些构造能使岩石产生felicity效应的应力门槛值_ ( max )降低；由高差应力水平下卸载时仍有大量声发射产生推测：在低差应力水平下，破裂以裂纹尖端的突然扩展为主；在高差应力水平下，沿已有的裂纹面的滑动破裂大量增加。