据我所知，她从未在国外工作过。

___To ___the ___best ___of ___my ___knowledge, she's never worked abroad.

此外，据我所知，城里没有地方能尝到这么可爱的蘑菇。

Besides, ___to ___the ___best ___of ___my ___knowledge, nowhere in the city can [you] try such lovely mushrooms.

据我所知，会议早上9点开始。

___To ___my ___knowledge, the meeting starts at 9 am.