He's a ruthless businessman, as I know to my cost.

我吃了苦头后才知道他是个无情的商人。

《牛津词典》

His brother Akbar said, "Akmal has struggled for many years with what we now know to be a serious mental illness."

他的兄弟阿克巴说：“阿克马尔多年来一直在与我们现在所知道的那种严重的精神疾病挣扎。”

youdao

Work to do what you know to do.

会因为你没按照你所知道的去做。

youdao

"Vice President Lyndon Johnson has left the hospital in Dallas, but we do not know to where he has proceeded.

VOA: special.2009.08.16

Milton wants to create the illusion that he's predicting, or that he's prophesying, the actions recounted in the poem, as if Milton were prophesying what of course we know to be already past.

弥尔顿想给我们一种他在预言，诗中所叙之事的感觉，似乎他是在预言这些我们都知道已经发生了的事情。

耶鲁公开课 - 弥尔顿课程节选

I know to be a judge, you can't just become a judge, you usually have to practice as a lawyer first.

就我所知，你不能一开始就成为法官，你必须先成为一名律师。

为了更美好的世界 - SpeakingMax英语口语达人

This guide will give you all to know to capture a truly epic adventure.

CNN: World's best unknown hike: Japan's Kumano Kodo

Andy Pettitte, who I know to be honest and decent, has since confirmed this.

NPR: Before Congress, Clemens Insists He Is Innocent

"It's difficult to know, difficult to know, " a Yahoo employee said when asked about the matter.

FORBES: The Yahoo! Saga