中国人口占世界人口的 １／５，严重制约了中国的经济发展。如果很好地解决 了这个问题，我们国家将很快成为世界强国。西部大开发是解决这个问题很重要的 一个方面。我国人口平均密度远低于日本人口平均密度。日本人口１．４５亿，占中国 （１２亿）的 １／ ８，日本国土为 ３ China’s population accounts for one-fifth of the world’s population, seriously restricting China’s economic development. If this problem is solved well, our country will soon become a world power. The development of the western region is an important aspect of solving this problem. The average population density in our country is much lower than the average population density in Japan. Japan has a population of 145 million, accounting for one eighth of China’s 1.2 billion and Japan’s three