study的过去式和过去分词怎么写

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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。