He urged the committee to discount any secondhand knowledge or hearsay.

他敦促该委员会不要相信任何二手的消息或传闻。

《柯林斯英汉双解大词典》

Certainly, no all-round knowledge can be acquired merely by glancing this way and that and relying on hearsay.

东张西望，道听途说，绝然得不到什么完全的知识。

《新英汉大辞典》

youdao

Of course the NCAA, Auburn, another member institution, a real and sober journalist, or some hearsay-free person of first-hand knowledge may still reveal facts of serious NCAA violations by Cam alone.

FORBES: The Heisman Voters' Dilemma: Facts Vs. Faith