regional customary international law

例句：

1. 1. The regional customary international law isthe basis for the development of international trade.
   区域习惯国际法是国际贸易发展的基础。
2. 2. Theregional customary international law has been widelyaccepted by the international community.
   区域习惯国际法已被国际社会广泛接受。
3. 3. The regionalcustomary international law playsan important role in protecting therights and interests of people from differentregions.
   区域习惯国际法在保护不同地区人民的权利和利益方面发挥着重要作用。