例句：
Why oh why do people keep leaving the door open?
人们到底为什么总敞着门呢?
For reasons of security the door is always kept locked.
为了保证安全，门总是锁着的。
You can't open the door from the outside.
你从外边打不开这个门。
The door was open and on impulse she went inside.
门开着，她一时心血来潮就走了进去。