vigor

If you want to retain youthful vigor,you have to take regular exercise.

如果你想保持青春活力，你就得经常锻炼。

In fact, the huge inheritance does not do him any good, but tends to undermine his vigor and passion for life.

实际上，这么大笔的遗产对他不仅没有什么好处，反而会损害他的活力和对生活的激情。

They would be lying there in the tree like, 'Oh, just let me just die up here, ' because they lacked any kind of vigor.

因为它们一点活力都没有, 他们会整天在树下躺着，一付‘噢，实在活不起了，让我死在这里好了’的样子。