never know

基本解释

I never know such a man.
我从不认识这样一个人。
One of the uncertainties of military duty is that you never know when you might suddenly get posted away.
军事任务的一个不定因素是，你决不知道什么时候会被突然调离。
I’d like to hope that but you never know.
我希望如此但你永远也不知道结果如何。

As long as I paid my medical school fees every year, my family would never know I wasn't attending any classes.
It led to water, ambiguous, universal water, just as 42nd Street in New York leads to water and you never know where you are.
那里通向大海，通向浩瀚无际的大海,就象纽约通向大海的第42街。
耶鲁公开课 - 1945年后的美国小说课程节选
Now we will never know, and don't let anyone ever suggest to you that you will ever know, what Milton could possibly mean by this deliberately perplexing image of the two-handed engine at the door.
我们永远不会知道,弥尔顿在这句描写门边的双手引擎的,刻意的意象叠加里想要表达什么。
耶鲁公开课 - 弥尔顿课程节选

Because you never know: This might be the year that nature takes a sabbatical.
NPR: Morel Satisfaction: Stalking the Wild Mushroom