What always has at least ten letters in it and may have tens of thousands of letter?各位大侠帮帮忙,小女子感激不尽
问题描述：
What always has at least ten letters in it and may have tens of thousands of letter?
各位大侠帮帮忙,小女子感激不尽
答
post office
刚好十个字母
而且可能有成千上万的信（letter）
不知道对不对～