Many deaths involved strokes or heart failure that worker rights groups attribute to the strain of excessive labor.
很多死亡包括中风、心脏衰竭，劳工权利团体将这归结为过度劳动的压力所致。
An important characteristic of instability failure of coal and rock which is subjected to external loadings is that its deformation possesses property of strain softening.
煤岩体在外载荷作用下发生失稳破坏时的一个重要性质就是其变形具有应变软化的特征。
The complete stress-strain curve of rock could be divided into pre-failure and post-failure regions according to the peak stress.
岩石的应力-应变全过程曲线以峰值应力为界，通常分为破坏前区和破坏后区两个部分。
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