Although my English level isn't very well, I had to write cross-border mail recently... the person I contacted with is a diplomat, which I felt really troublesome and ashamed.

虽然我的英语水平不好，近日却不得已天天与人写跨国邮件，对方还是个外交官，真是又累又惭愧。

youdao

In December 2006 and October 2007, Customs and Border Patrol agents inspecting shipments through the Chicago O'Hare International Mail Facility found three parcels containing the collection of fossils.

CNN: Ancient bones seized, returned to China