elastic
单词辨析：
指伸展后容易恢复原状的，喻指规定、政策等灵活多变的。
Rubber is elastic.
橡胶有弹性。
The rules are elastic.
这些规定不是一成不变的。
Our diplomatic policy is elastic.
我们的外交政策是灵活的。
多指金属有延展性的，也指黏土等易变形的。
This metal is workable and ductile.
这种金属易加工，延展性也好。
Wax is ductile when heated.
蜡在受热时是可塑的。
多指材料有柔韧性的。
This material is flexible.
这种材料有韧性。
I love the pair of shoes with flexible rubber sores.
我喜欢这双带弹性橡胶底的鞋。
相关例句：
The elastic layered half-space soil model is established in the cylindrical coordinates.
建立了柱面坐标系下分层弹性半空间地基土模型。
The cloven hooves are sharp edged, elastic and concave.
蹄锋利，呈凹形，富有弹性。
If export and import demand is elastic, then the change in trade volumes will operate to remove the surplus.
如果进出口需求具有灵活性，那么贸易额的变化则可能会抵消盈余。
This paper gives an accurate analytic method of lateral natural vibration of beams with lumped masses and elastic supports.
本文给出带集中质量和弹性支承梁横向固有振动的精确分析方法。
This time-dependent elastic behavior is known as anelasticity.
这种与时间相关的弹性行为称为滞弹性。
You should also be familiar with momentum and kinetic energy for elastic and inelastic collisions.
你应该熟悉弹性和非弹性碰撞下的动量和动能变化。