study的过去式和过去分词都是：studied；例句：He studied philosophy and psychology at Yale. 他在耶鲁大学学习哲学和心理学。Debbie studied her friends face for a moment. 黛比端详了一会儿她朋友的脸。
相关介绍：
Coincidentally, they had both studied in Paris.
碰巧的是，他们俩都在巴黎学习过。
He studied conscientiously and enthusiastically.
他认真积极地学习。
Many toxic effects can be studied at the cellular level.
许多毒性作用在细胞阶段就可加以研究。
温馨提示：
