played的同类词有studied、relaxed

例句

1、

They studied the geographical distribution of the disease.

他们研究了这种疾病的地域分布情况。

2、

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。

3、

She studied chemistry for three years.

她学了三年化学。