diplomatic bag
noun [ C usually singular ] uk/dɪp.ləˈmæt.ɪk ˌbæɡ/ us/dɪp.ləˈmæt̬.ɪk ˌbæɡ/ (also diplomatic pouch)
外交信袋，外交信件袋
a container in which letters are sent between diplomats without being examined by customs officials
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