Keep correspondence in the future!
在将来保留书信！
Step 2: Keep correspondence records.
第二步：保存通讯费用记录。
We keep up correspondence recently for several years.
我们几年来一直保持通信联系。
Make copies of any written correspondence and keep notes about any phone conversations.
复印任何写出来的通讯费用记录，并且记录下每一次电话通话。
Make sure you keep copies of all correspondence, including relevant documentation.
所有的来往信函都要有备份，包括相关的证明文档。
Make sure you keep copies of all correspondence, including relevant documentation.
所有的来往信函都要有备份，包括相关的证明文档。
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