木材不是完全弹性体，其力学性质具有明显的粘弹性。
Being not a perfect elastic substance, wood behaves some viscoelastic properties in many respects.
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.
气体和液体都是完全的弹性体。
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