"门对门"是个多义词，它可以指门对门（购物配送公司）。
四合院的房子门对门围绕院子四面建成。
Because the houses were built facing each other around courtyards.
快递有专人负责上门收件，是门对门的上门收发件服务。
Be responsible for door-to-door delivery charge, the door is the door to receive a service.
本发明的主要用途是解决城市公众准门对门快速方便出行。
The invention is mainly used for solving the problem that the city public can quickly and conveniently travel in a door-to-door way.
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