Special instances of plastic flow are cold flow, which occurs in vulcanized rubber after low stress has been continuously applied for a long time, and creep of metals.
塑性流动的特殊情况是冷变形，发生在硫化橡胶长时间连续承受低应力时以及金属蠕变时。
Metal flow takes place within the plastic range of the metal, so that the bend retains a permanent set after removal of the applied stress.
金属的流动发生在金属的塑性变形范围之内，因此在施加的外力去除之后弯曲保持永久的变形。
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