No wonder so many of our readers now refill cartridges at office-supply stores or print out only essential documents.

难怪我们很多读者现在只打印必要的文件。

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Essential documents are those documents which individually and collectively permit evaluation of the conduct of a trial and the quality of the data produced.

必需文件是指那些可单独和合起来用于评价试验的实施及所产生的数据质量的文件。

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Maintain records that document shipment, receipt, disposition, return, and destruction of the investigational product (s) (see 8. Essential Documents for the Conduct of a Clinical Trial).

保存那些运输，接收，处理，返回和销毁研究产品的文件记录见。

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Lehrman sees the documents as an essential tool of education.

FORBES: Magazine Article

When most executives think about leadership succession, they envision a methodical, pain-staking process, a steady flow of meetings, memos, drafts, and eventually hard documents spelling out the essential elements of executive transition.

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