水洞沟：东西方文化交流的风向标？&兼论华北小石器文化和石器之路的假说传说这个小院是北京四大凶宅之一。
Shuidonggou : a vane of intercommunication between the East and the west ? & discussion about small tool culture in North China and a hypothesis of the lithic road ;
水洞沟