Many toxic effects can be studied at the cellular level.

　　許多毒效可以從細(xì)胞層次上去研究。

　　She studied chemistry for three years.

　　她學(xué)了三年化學(xué)。

　　I studied English and Drama at college.

　　我在大學(xué)學(xué)的是英語和戲劇。

　　My brother studied at the Royal College of Art.

　　我哥哥曾就學(xué)于皇家美術(shù)學(xué)院。

　　The report found that 30% of the firms studied had failed within a year.

　　據(jù)報告稱，受調(diào)查的公司有30%一年內(nèi)倒閉了。