If someone comes to your door you should always ask for some form of identification, no matter who they say they are.如果有人上门来，一定要叫他们拿出身份证明来给你看，不管他们自称是谁。The furnace man came to repair the heater.锅炉工上门来修理加热器。It really gets my back up when salesmen call round to the house.有推销员上门来的话我会很恼火。He knew it was only a matter of hours before the police came for him.他知道过不了几个小时警察就会上门来抓他。