toughness

The steel used in car frames is tested for its toughness to ensure safety during collisions.

(Chinese) 汽车框架所用的钢材都要经过韧性测试，以确保碰撞时的安全。

The marathon runner's mental toughness helped him finish the race despite his injury.

(Chinese) 尽管受伤，那名马拉松选手的顽强意志力仍帮助他完成了比赛。