我当时不知道罗恩有那么坚强的个性。I didn't know Ron had that much strength of character.我不知道自己要去上哪所大学.I didn't know what college I wanted to go to.现在还不知道有多少人在枪林弹雨中身亡。It's still not known how many died in the volleys of gun...

“不知道”的英语可以翻译为：hear nothing of，be ignorant of，be insensible of，be unaware of，in the dark ...