你的分机号码是多少？
By the way, the number of the telephone on your desk is extension 506.
顺便说一下，你桌上的电话号码是分机506。
The extension number is exactly the same as your room number.
您的分机号码就是您的房号。
The extension number is just the same as your room number.
房间的分机号码和房号刚好相同。
The extension number is just the same as your room number.
房间的分机号码和房号刚好相同。
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