to the best of my knowledge
US /tə ðə bɛst əv maɪ ˈnɑlɪdʒ/
UK /tə ðə bɛst əv maɪ ˈnɑlɪdʒ/

1.
据我所知, 在我所知范围内
based on what I know or understand; as far as I know
:
•
To the best of my knowledge, he has never been late for work.
据我所知,他上班从未迟到过。
•
The report is accurate, to the best of my knowledge.
据我所知,这份报告是准确的。