It's a science
一门───One door;科学───science
One door had been blocked up.───一扇门被封死了。
One door to one room: that's it.───一扇门对一个房间：仅此而已。
Only one door was closed.───只有一扇们是关闭的。
On the front foot foot train, just one door, the door is closed, then the train started.───前脚上火车，后脚刚一进门，车门就给关上了，紧接着火车开动了。
There was no answer and Madame Defarge quickly opened three of the doors and saw that the rooms were empty. One door was still closed.───得法热夫人没听到答话便迅速打开了其中的三扇房门，看到房间是空的。有一扇门还关着。
When one door of happiness closes , another opens ; but often we look so long at the closed door that we do not see the one which .───当一扇幸福之门关闭，另一扇却打开了；但是我们常常死死盯着那扇关闭的门以至于看不到另一扇门已为我们打开。
One door had been blocked up.
God never shuts one door but he opens another.
One door, his head on the hard to hit the door, the pain he could not to rub his hands, while looking at the low than the normal standard door.
With a slam, the wind closed one door while the curtain fluttered toward the room.
When one door of happiness closes, another opens; but often we look so long at the closed door that we do not see the one which has been opened for us.