a.

1. 有弹性的，有弹力的
   Rubber is elastic.

   橡胶有弹性。

2. 灵活的，可伸缩的
   My plans are fairly elastic.

   我的计划相当有弹性。

3. （心情）能恢复的；开朗的
   Don't worry about him; he is a cheerful and elastic man.

   别为他担心；他是个快活开朗的人。

n.

1. 橡皮带，松紧带；橡皮圈[U][C]
   It snapped back like a piece of elastic.

   它像一条橡皮带那样迅速弹回。

adj.

1. able to resume normal shape spontaneously after being stretched or squeezed.
2. flexible and adaptable:
   the definition is elastic.
   ▸Economics  (of demand or supply) sensitive to changes in price or income.
3. Physics  (of a collision) involving no decrease of kinetic energy.

n.