She is quiet and studious, in marked contrast to her sister.

她沉静勤奋，与她妹妹形成了鲜明的对照。

《牛津词典》

Thurston was quiet, studious, brilliant and good-looking in a boyish way.

瑟斯顿安静、勤勉、聪明，象小青年一样漂亮。

youdao

By the sixth form, he had gone from a quiet studious boy to a popular outgoing young man, known among friends as the life and soul of a party.

BBC: Obituary: Philip Russell