Studies on the international legal systems of standby letter of credit 并列题名：Studies on the international legal systems of standby letter of credit Research on the international legal system of diplomatic protection Study on the international systems of protecting plant variety 并列题名：Research on the international legal system of diplomatic protection in the aspect of demand guarantee and stand-by letter of credit Rearch on the international legal system for the safeguarding of intangible cultural heritage 并列题名：Rearch on the international legal system for the safeguarding of intangible cultural heritage