燕园四咏(之三)续:高高低低的垣,深深邃邃的院,绵绵亘亘的山,洒洒落落的仙。高高低低的垣(见2016年第1期)。深深邃邃的院院,是墙垣围出来的,有墙就有院。北大本身就是一个套在墙垣里的大院,和其他单位大院一样,是城市肌理中一个封闭的空间单元。庭院深深深几许,这个大院究竟有多深,只有进了大门,亲身徜徉其中才会知道。然而,即使进入校内,各个院系 Four seasons (three) of Yuanyuan continued: The hilly walls, deep deep courtyards, stretches through the mountains, sprinkled cents. High and low wall (see No. 1 in 2016). Deep deep courtyard, is surrounded by walls, walls have homes. Peking University itself is a compound in the wall of the compound, and other units of the compound, is a closed urban space texture unit. How deep the courtyard a few deep, how deep the compound, only into the door, which will only know. However, even if entering the school, each faculty