The rate of fall-off of the interfacial residual stress with the rise of the annealing temperature is different in the two systems.

在两体系中，界面残余应力随温度升高而下降的速度不相同。

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Moreover, as the chart shows, the rate of change has speeded up over the course of that period. (The sudden fall-off at the end is caused because the linkage-disequilibrium method cannot easily detect very recent mutations, rather than by a sudden reduction in the rate of evolution.) The researchers put this acceleration down to two things.

ECONOMIST: Human evolution