It's time you had the doctor checked over. 你得找个大夫好好检查检查了。

　　How long does it take for a mechanic to check the car over? 技师检查车辆受损情况需要多久？

　　The doctor is checking over a guy who just got run over by a bus. 医生正在检查刚刚被大巴撞到的男子。

　　You should check over this term paper.  你得好好检查一下期末报告。

　　Why? Are there mistakes on it? 为什么？难道有什么错？