Correct

弹力

/ tánlì / 
Strokes

Definition

elasticity/elastic force/spring/rebound/bounce

Example

As a Noun

elasticity; elastic force; spring; resilience

1
Zhè
这
gēn
根
xiàngpíjīn
橡皮筋
yǐ
已
shīqù
失去
tánlì
弹力
  
。

The stretch has gone out of the rubber band. / This is a perished rubber band.