This is confidential, but I know that I can rely on your discretion.

这是机密，不过我知道你靠得住。

《牛津词典》

I don't know that I can finish it by next week.

我没有把握能在下周完成。

《牛津词典》

I know expert of that, but I think you can try lifting weights and do at least 200 sit-ups twice a day.

我知道这方面的专家，但我认为你可以试试举重并且做至少200个仰卧起坐，每天做两次。

youdao

Sam Kass said: "After hearing fifth graders cheer for broccoli, I know firsthand that chefs can have a huge impact on kids' health and well-being."

VOA: special.2010.06.07

What I just spent many lectures discussing is the fact that we can not know how far away an electron is from the nucleus, so we can't actually know the radius of a certain atom.

我花了这么多课时所讨论的正是我们,不可能知道电子离原子核有多远这一事实，因此我们不可能知道某个原子的半径。

麻省理工公开课 - 化学原理课程节选

I mean that can include... you know, me... sneaking my way into an award show that I don't belong at

我的意思是那包括……我……偷偷溜进我本不该进的颁奖典礼，

向哥伦布学习 - SpeakingMax英语口语达人

If I do that, I know I can play on a very high level.

CNN: Clijsters faces Li in Aussie final rematch

But I really like that I know I can run a mile - the idea of a half-marathon isn't so out of the realm of possibility these days.

CNN: Paging Dr. Gupta Blog

My prediction is that it will probably come in June but I can't absolutely be certain of that and my prediction is that I know that we can win and my prediction is that we'll now pull together and we'll do enough to win but I know certainly that we can.

BBC: News Online