长江流域横贯我国中部,地势西高东低,在北部和南部有秦岭和南岭的东西阻隔,使其在地理上与其他地域分开,形成了一个相对独立的、封闭的经济单元。这种地域上的封闭性与市场经济条件下市场的开放性要求之间就存在着尖锐的矛盾。正因为这个矛盾的长期存在 The Yangtze River valley traverses the central part of our country. The terrain is high in the west and low in the east. There are barriers between the Qinling Mountains and the Nanling in the north and south, separating it geographically from other areas and forming a relatively independent and closed economic unit. There is a sharp contradiction between this geographical closure and the market’s openness requirement in a market economy. It is precisely because of this long-standing contradictions