Research on legal issues of cross-border data flows Research on legal issues in cross-border education 并列题名：Research on legal issues in cross-border education Study on international legal issues of cross-border data flow Research on legal issues of cross-border transaction of digital currency Research on vat taxation issues in cross-border digital supplies Research on legal issues of medical tort Studies on legal issues in cross-border insolvency Research on legal issues of usufruct in France Research on legal issues of equity transfer