Reduce the volume of paper coming in by sorting mail over the recycling bin or trash, keeping only those papers that require an action or filing.

减少流入文件的数量，利用垃圾桶来分类邮件，仅仅保留那些需要处理或归档的文件。

youdao

Correspondents did as they were bidden, filing their copy by air-mail letter or, in later years, by telex.

ECONOMIST: Nancy Balfour