- letter missive
- 公文: official document
- 函件: letters; correspondence
- 送文函: letter of transmittal
- 公文: official document◇公文包 portfolio; 公文袋 document envelope; 公文旅行 travel of documents; bureaucratic red-tape; odyssey of official papers; 公文纸 paper for copying documents
- 蓝哥文函数: langevin function
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