◆to your knowledge or to the best of your knowledge就某人所知；据某人所知
To the best of my knowledge, Gloria did not make these comments.据我所知, 格洛里亚没有说过这些话。
Alec never carried a gun to my knowledge.据我所知, 亚历克从来不带枪。
not to my knowledge据我所知, 没有
Did Leanne take drugs?—Not to our knowledge.利安娜吸毒吗？——据我所知, 不吸。