The object of this article is the outer environment of highrise settlement , the authors look it as a basic unit . In virtue of the principle of cytology , the authors analyse the boundary ?the nucleus and the close greenbelt of the basic unit, trying to find a befittingly way for the outer environment of highrise settlement.Boundary, nucleus and close greenbelt form the system of the outer environment of highrise settlement , each part of the system have their own function , they compose a basic cell together. For example, boundary should have controllable penetrability and unitary discemment; nucleus should be on share and characteristic; close space should have homogeneous environment and consistantance.
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