Grant was beginning to learn an important lesson of the war.

VOA: special.2009.12.03

Now, this is an important lesson in what you do in science.

现在是你们科学教育中,的重要一课。

麻省理工公开课 - 热力学与动力学课程节选

Why are we doing this? Because there's an important lesson here.

为什么要学这些,因为有个重要结论

耶鲁公开课 - 博弈论课程节选

In the process,he says, he learned an important lesson about baking and life.

VOA: standard.2010.07.16