He said it is important to note that many of the people who are fighting for reform are the same people who know the system best the doctors and nurses of America.

VOA: standard.2009.10.05

And an important thing to note is in terms of what that physically means, so physically the binding energy is just the negative of the ionization energy.

一个需要注意的很重要的事情,是它的物理意义，从物理角度来说结合能,仅仅是电离能的负数。

麻省理工公开课 - 化学原理课程节选

You want to use "it is important to" to emphasize or to make note of something that you hold close.

你使用“it is important to”来强调或说明你认为很重要的事情。

It's important 课堂 - SpeakingMax英语口语达人