exertion
n.努力；费力；（能力、权力等的）运用；行使
网络解释.尽力；运用；用力；费力
词形变化:
复数：exertions
effort diligence labor
双语例句
1. 1 . Age diminishes the heart's ability to pump harder and faster under exertion .
随着年龄的增加，人在消耗体力时心脏的输血能力和输血速度会有所减弱。
来自柯林斯例句