quiet的名詞是啥

　　But it was a different kind of quietness.

　　然而，卻是另一種寧靜。

　　In a living room environment, consumers demand quietness.

　　在客廳環境中，客戶需要安靜。

　　Behind that quietness his nerves are jangling, he's in a terrible state

　　表面看上去沉默不語，其實內心非常煩躁不安，他的情況糟透了。

　　I enjoy the quietness of the country.

　　我喜愛鄉村的寧靜。

　　She went on, boasting of her quietness, yet speaking with a kind of contained exaltation.

　　她滔滔不絕地說著。她自詡很平靜，她的口氣卻包含著一種強自抑制的興奮情緒。