当材料的形变超出弹性形变发生的范围，其应力将不再与应变成正比，永久的、不可回复的形变发生，即为塑性形变。

As the material is deformed beyond the strain that elastic deformation persists, the stress is no longer proportional to strain, and permanent, nonrecoverable, or plastic deformation occurs.

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弹性体是聚合物的一个种类，它的应力-应变曲线表明其变形是完全弹性的，即很低的应力变化就会产生很大的可回复应变。

Elastomer is a class of polymers whose deformation displayed by strain-stress curve is totally elastic i. e. large recoverable strains produced at low stress levels.

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营业时间内随时有工作人员值班，可回复您有关馆内或是附近的问题。

There is always a staff member available during business hours to answer any questions regarding the shopping center and its vicinity.

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