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，这个城市里没有地方能尝到如此美味的蘑菇。

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

据我所知，还没有人解决那个问题。

___To ___my ___knowledge, no one has solved that problem yet.