... 丝织封 Silk cover 公函封 Official mail envelope 遇难封（海难）Wreck cover ...
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公函封
Official envelope
以上为机器翻译结果，长、整句建议使用 人工翻译 。
没说，太太。信是从城里寄来的，只是一封公函。
No, ma 'am. It came from town, and is merely a letter of business.
youdao
她收到了一封解释性的公函。
She received an official letter of explanation.
信是从城里寄来的，只是一封公函。
It came from town, and is merely a letter of business.
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