1police officer; policeman (general term for any police officer)
2police constable (lowest rank in mainland China and Hong Kong)
Examples
qún zhòng群众fáng ài妨碍le了jǐng yuán警员zhí xíng执行rèn wu任务。
群众妨碍了警员执行任务。
The crowd obstructed the police in the discharge of their duties.
现场有10名警员。
There were ten police officers on the spot.