你可以说 "The girl is very quiet." 来表达女孩真安静这个意思。

"Quiet" 是英文中常用来形容某人或某事不吵闹、安静的形容词。它来自拉丁文 "quietus",意思是 "平静、安宁"。

下面是一些使用 "quiet" 的例句:

She was very quiet throughout the movie. (她在整场电影中都很安静。)
The room was so quiet that you could hear a pin drop. (房间非常安静,你甚至能听到针掉在地上的声音。)
He was a quiet man, who rarely spoke unless he had something important to say. (他是个沉默寡言的人,除非有重要的事情要说,否则他很少开口。)