跑得较快的赛跑者定出速度。
随着冲击速度的提高，材料具有应变率正敏感性，但到一定程度材料反而显示出应变率负敏感性。
With the increment of impact velocity, the new material appears positive strain rate sensitivity, but when the increment reaches a certain degree, the material shows negative strain rate sensitivity.
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