6Wu Z, Yao C ,Zhao D, et al. Sino-MONICA project: a collaborative study on trends and determinants in cardiovascular diseases in China, part i: morbidity monitoring. Circulation ,2001,103:462-468.
7费孝通:《"三级两跳"中文化思考》,《读书》2001年第4期.
8Wirth, L. Urbanism as a Way of Life. American Jour- nal of Sociology, 1938, 44: (1).