Many toxic effects can be studied at the cellular level.
许多毒效可以从细胞层次上去研究。
She studied chemistry for three years.
她学了三年化学。
I studied English and Drama at college.
我在大学学的是英语和戏剧。
My brother studied at the Royal College of Art.
我哥哥曾就学于皇家美术学院。
The report found that 30% of the firms studied had failed within a year.
据报告称，受调查的公司有30%一年内倒闭了。