I know that this is a bad time to ask for help.

我知道在这时候要求帮助不合适。

《牛津词典》

We all know that cheating on our taxes is a no-no.

我们都知道偷税漏税是绝对不行的。

《柯林斯英汉双解大词典》

Every child needs to know that he is loved.

每个孩子都需要知道自己是有人爱的。

《牛津词典》

It says Paul moves in and out of the woods, so few people ever know that he is there.

VOA: special.2009.01.24

At this point in the story, perhaps the view is that all know of God even if they ignore him.

从这点来看,即使每个人都忽略上帝，但都知道上帝的存在。

耶鲁公开课 - 旧约导论课程节选

we know that h is always terminal, right after the molecule that it's attached to.

我们知道氢原子永远都在末端，放到和它成键的分子的后面。

麻省理工公开课 - 化学原理课程节选

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

Mr. MILLER: I'm no neuroscientist, but I think that as time goes on, you know, something that people tell us about that music is that you know, when I hear those songs, I can see what I saw and hear what I heard and feel what I felt when I first heard them.

NPR: Does Age Quash Our Spirit of Adventure?

Ms. NOVAK: Yeah, it's difficult to know, I mean we do sometimes wonder what we, you know, take a little heart in is that although we know that there is research showing that the brain tends to want to believe everything it hears and it takes some work to overcome that.

NPR: Campaign Attack Ads Call 'Facts' Into Question