Senses
入关/ 入關 to enter a pass
to enter a strategic mountain pass; to enter the region inside a pass, such as the Central Plains in ancient China
入关/ 入關 to clear customs
to go through customs or enter a border crossing
入关/ 入關 to join GATT
specifically refers to joining the General Agreement on Tariffs and Trade (GATT), the predecessor of the World Trade Organization