1、door作为名词，意思是门。如We could hear someone knocking at the door.我们能听到有人在敲门。Could you open the door, please?请把门打开好吗？
2、常见的短语有：the front door前门。the back door后门。a car door车门。a sliding door推拉门。out of the doors户外。door to door挨家挨户，门到门。
3、看两个例子：I prefer working out of the doors.我宁愿在户外工作。Joe sold vacuum cleaners door to door for years.乔多年来挨家挨户地推销真空吸尘器。
