I was a very quiet, studious little girl.

我那时是一个非常安静、用功的小女孩。

《柯林斯英汉双解大词典》

At that time, I was a shy and quiet girl. The teacher spoke so fast that I didn't understand her most of the time.

那时，我是一个害羞和安静的女孩。老师说得太快了，大部分时间我都听不懂。

youdao

I was so surprised and I could feel my face turning red, because when I opened the door, there at the front door and stood Sarah Westly—the quiet girl who sat next to me in music class—and she was holding a box.

我很惊讶，我能感觉到我的脸变红了，因为当我打开门的时候，站在前门的是莎拉·韦斯特利——那个在音乐课上坐在我旁边的安静女孩——她拿着一个盒子。

youdao

During the show one little girl was almost too shy to produce a meow "I heard one, a quiet one, " an actor announced solicitously while other children eagerly joined the fray on stage.

WSJ: Only Make Believe Performs the Highest of Art