This case lacked documentary proof.

本案缺少书面证据。

youdao

This system actually worked quite well as long as the underwriters collected the documentary proof (like income verifications).

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For example, the Sunday Telegraph of London reported on December 14, that Iraqi authorities have discovered documentary proof that Mohammed Atta, the al-Qaeda mastermind of the September 11 attacks against the U.S., was trained in Baghdad by Abu Nidal, the notorious Palestinian terrorist.

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