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。
标签：study,过去分词,过去
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