老年长期护理保险制度：中日韩的比较研究：comparative study between China, Japan and south korea comparative study between China, Japan and south korea 青年与社会变迁：中国和俄罗斯的比较研究：a comparative study between China and Russia 人口政策与国情：中韩比较研究：comparative study of China and Korea 企业家精神及社会变化：中日韩案例研究：case studies from China, Japan, and South Korea a comparative study between China and Russia 东亚社会合作：以中日韩三国的发展为例：a case study of China, Japan and South Korea