ardor

The young revolutionary spoke with great ardor about the need for social justice.

(Chinese) 这位年轻的革命者满怀激情地谈论着社会正义的必要性。

Despite his age, he still maintains a youthful ardor for mountain climbing and exploration.

(Chinese) 尽管上了年纪，他依然对登山和探险保持着年轻人的热情。