正如你从图纸上看到的，厨房有一扇门通往餐厅，另一扇通往起居室，第三扇通向外面。

As you can see from the drawings, the kitchen has one door into the dining room, another into the family room and a third to the outside.

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前两个都打开了，但第三扇门紧闭着。

The first two swung open, but the third held fast.

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他用了一种特殊装置，这种装置上有个鼠笼和三扇门。

He used a special apparatus which had a cage for the rat and three doors.

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