To know is one thing; to teach is another.

知为一回事，教是另一回事。

youdao

To know is one thing; to do ( is ) another.

知是一回事，行是另一回事。

youdao

To know is one thing, and to do is another.

知是一回事，行是另一回事。

youdao

"You know winning a gold medal on the field of play is one thing that speaks to your hard work and your dedication to being an elite athlete.

VOA: standard.2010.02.27

One thing to know methodologically is the person giving a choice is blind to the study.

研究方法上需要强调的一点是,主试对于实验来说是盲性的

耶鲁公开课 - 心理学导论课程节选

So there is one more thing you need to know.

所以这还有一个你们需要知道的知识点。

麻省理工公开课 - 固态化学导论课程节选

It is not easy to do, but one thing we do know is that the people who have authority in those communities, doctors, teachers, need to be figures who can credibly exercise authority.

BBC: News Online

But I would also have to say that Ruth Ginsburg is a realist, and one thing is certain, she must know that this is going to increase speculation about a possible retirement.

NPR: Justice Ginsburg Has Cancer Surgery

It is one thing to know that years of football will make it harder for an athlete to bend down and pick up his child when the athlete is forty.

FORBES: The Death of the NFL