近现代中国有过两次比较大的闭关自守和对外开放的经历。今天我们对这两次由闭关自守到对外开放嬗变的历史过程进行客观的分析和研究，不仅有助于我们加深对中国近现代史的学习和了解，而且更能提高我们对党的十一届三中全会以来改革开放路线的认识和理解，坚定我们走有中国特 In modern China, there have been two relatively large periods of self-defense and opening up. Today, we conduct an objective analysis and study of these two historical processes from the retreat to the evolution of the outside world. This not only helps us deepen our study and understanding of China’s modern history but also enhances our understanding of the party’s 11th session Since the Plenary Session of the reform and opening up the understanding and understanding of the line, firmly go our unique China