placidity [plə'sɪdətɪ]

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n.平静，安静，温和

a feeling of calmness; a quiet and undisturbed feeling

Miss Pross inquired, with placidity. 普洛丝小姐不动声色地问。
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。