海关关封【英】

customs envelope

译文来源

http://english.customs.gov.cn/statics/348409bc-0019-403a-ba9c-950396723f02.html

例句

1. 由记者（或出具保函单位）向原进境地海关提交出境地海关批注签章的“保证函”或海关关封，办理“保证函”结案手续。——《海关对外国记者随身携带采访器材通关指南》

1. The journalists (or the issuing organizations) shall submit the letter of guarantee noted and stamped by the customs at the place of exit or the customs envelope to the customs at the place of entry to complete the closing procedures on the letter of guarantee.—Quoted from Guide to Customs Clearance of Reporting Equipment Carried by Foreign Journalists