pertness

例句：

1. 1.The dog is pertness in the woods.
   这只狗在树林里非常敏捷。
2. 2.She was quick to respond to the situation.
   她对这种情况反应很快。
3. 3. The athlete had great agility on the track.
   这位运动员在跑道上非常有灵活性。