fortitude：（在痛苦、危险或困难面前表现出的）勇气、坚韧和自制力
He bore the pain with great fortitude。
他以极大得毅力忍受了痛苦。
endurance：忍耐力
He showed remarkable endurance throughout his illness。
他生病得整个过程都表现出非凡的忍耐力。
（特）endurance 作定语 endurance test 耐力测验
endurable（adj）可忍耐的，可容忍的
But this delusion makes short-term setbacks endurable.
但这种错觉让我们能够忍受短暂的挫折。
I am a man who would live an heroic life and make the world more endurable in his own sight.
我是一个矢志要做一番英雄业绩、使这个世界在自己眼里变得更加易于接受的男子汉。
During this period, your body undergoes a series of changes that makes continued exposure to hot conditions more endurable.
在这一阶段，身体肌肤会经受一系列的改变，从而增强其持续的暴露在阳光下的能力。
enduring（adj）持续的，持久的
That is not the basis for an enduring affinity.
但是这不是一种持久亲近关系的基础。
An enduring feature of human nature is if there's something of interest near us, we generally look at it.
人类天性中一个持久的特征就是如果附近有什么有趣的东西，我们大多会看它。
Let us apply this enduring wisdom to our work today. Out of the competition of ideas, let us find unity in action.
让我们将这种不朽的智慧应用到今天的工作中，在百家争鸣的思想中，找到行动上的统一性。