这批文件中保留了许多法国的原始派遣信件，我意识到这是无价之宝。
Many original French dispatches had been preserved in this collection, which I realized was priceless.
4保留下文件和你收到的书面信件，使用背面作为快速笔记薄或便条纸。
4keep documents and paper mail you receive and use the back side as quick note pads or scratch paper.
他还保留了信件的草稿，有许多其实没有顺利寄出。
And he kept drafts of letters he sent, most of which never got through.
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