What kind of losses has China suffered on the issue of modern frontiers?

{"info":{"title":{"content":"中国在近代边疆问题上吃了哪些暗亏？","en":"What kind of losses has China suffered on the issue of modern frontiers?"},"description":{"content":"葛剑雄今天主要与大家分享的话题是\"中国边疆问题的由来\"，我本身专业是历史地理，现在的身份是复旦大学中国历史地理研究中心教...","en":"Ge Jianxiong is mainly sharing with you today the topic of \"the origin of China's border problem\", I myself am a major in historical geography, and my current identity is a professor at the Chinese Historical Geography Research Center of Fudan University."}},"items":[]}