The swift and indifferent placidity of that look troubled me.

那一扫而过的冷漠沉静的目光使我深感不安。

SOD shown relative placidity and high activity during storage.

SOD在整个冷藏期间其活性相对平稳。

Placidity is a living experience and elegance is a living attitude.

平静是一种生活体验，优雅是一种生活态度。

Aunt Gillenormand surveyed all this with her imperturbable placidity.

吉诺曼姨妈平静而沉着地望着这一切。

What it lacks in dynamism it makes up for in placidity and a common national identity.

它的平静和共同的国民认同感弥补了其活力的不足。