如果他们是两个人的话：Both of them are policemen.
Each one of them is policeman.
如果他们是三个或者以上的话：All of them are policemen.
Every one of them is policeman.
如果他们是两个人的话：Both of them are policemen.
Each one of them is policeman.
如果他们是三个或者以上的话：All of them are policemen.
Every one of them is policeman.