periods例句
He has spent
periods in prison, where he was gruesomely tortured.
他坐过几次牢，在牢里受到非人的折磨。
The training covers extended
periods in obstetrics and gynaecology.
该培训包括产科学和妇科学的增加课时。
His painting went through both representational and abstract
periods.
他的绘画经历了具象风格和抽象风格两个阶段。