The teacher asked us to re-examine our test papers to make sure there were no mistakes.

re-examine 由前缀 re-（表示“再次”）和动词 examine（检查）组成，字面意思是“再次检查”。前缀 re- 加在动词前常表示重复某个动作。 examine 的意思是“检查、审查”，指仔细查看或研究某事物。 re-examine 合起来表示“重新检查”，强调对已经检查过的事物进行再次核查。