产地标记 meaning in Chinese

indication of origin
indication of source

Without an identical external tariffs , the agreement provides strict rules of origin marking to ensure the parties benefits and prevent that the good of other countries is imported into the territory of the party with lower tariff so that the good can be imported into the territory of other parties
因缔约国并没有统一的对外关税，所以为了保护缔约国的利益，协定也有严格的产地标记规则以防止非成员国从关税较低的成员国转口到其他成员国。所以协约国的关税减让进程也就成了协定要解决的主要问题。