她坐在那里，周身散发着一种宁静的气息。

She sat there with an air of ___serenity about her.

艺术为他们的生活带来宁静。

Art brings ___serenity to their life.

独自在森林中漫步时，我感受到了极大的宁静。

I find great ___serenity while walking alone in the forest.