I know that he has tried hard; be that as it may, his work is just not good enough.

我知道他已经尽力了，尽管如此，他的工作仍不太理想。

《牛津词典》

I know it sounds crazy but it just might work.

我知道这事听起来很蠢，然而也许就会奏效。

《牛津词典》

And I know just the thing to add to our work to make it even more interesting.

而且我正好知道该在作业中加点什么，使它更生动有趣。

youdao

"Unfortunately it just didn't work out today, but I think they have a lot to be proud of and I know our entire coaching staff is extremely proud of them."

VOA: standard.2010.02.26

As early as 1803, we know he's working on-- Trying to get this to work just right.

早在一八零三年,我们就知道他开始,努力去使它恰如其分

耶鲁公开课 - 聆听音乐课程节选

so I don't know, I think it's just really cool to be able to work something from the ground up.

所以，我不知道，我就是觉得能从头开始做一件事很酷。

什么是认知科学？ - SpeakingMax英语口语达人

But I think we just heard what's really - what will work and, you know, I just - I haven't spoken to Senator Kirk relative to this, although we've worked together in the past on a number of issues.

NPR: Pick 'Em Up, Lock 'Em Up: Getting Tough On Gangs

"They just know how to work the system and they work it very well and always to their advantage, " he said.

CNN: July 8, 2012 -- Updated 1911 GMT (0311 HKT)

He is a complete person not just someone you know from work, Jarvis argues.

BBC: Google+ and the friends v acquaintances debate