As the decline of fertility and the extension of life expectancy,the population age structure has had the great change.The population age structure changes must
<正>We went to Ningbo City,Zhejiang Province,for the purpose of gathering the story between a man and the city. When we arrived at Ningbo,a coastal city connect
<正>Currently,China is in a critical period of economic and social transformation.Reform is the key to maintain stable growth and stimulate vitality.Since the b