少壮的英文：
youthfulness

KJV] Thou shalt tread upon the lion and adder: the young lion and the dragon shalt thou trample under feet.
[新译]你必践踏狮子和虺蛇。你必踏碎少壮狮子和大蛇。

The Flight of Youth
青春飞逝

My youth and youthful strength fled long ago.
我的青春和青春的活力早已消失。

The youth has plenty of go in him.
这个年轻人干劲十足。

You should consider his youth.
你应体谅他的年轻。

a nation in its youth
建国初期