"We recommended hemorrhage drills just like fire drills. For an event that doesn't happen very often, people need to practice.

VOA: standard.2010.06.23

We have, for example, bomb drills just in case something happens people think it's right When thing happens once and you move on, go back to life, just as something goes wrong and then you move on.

例如，我们有，炸弹演习以防发生什么事情,人们认为这是应该的,发生了一件事，你要继续正常的生活，正如某事出了点问题，然后你继续前行。

普林斯顿公开课 - 人性课程节选

In the past, Pyongyang has strongly condemned U.S.-South Korean drills, claiming they are preparations for an invasion of the North.

VOA: standard.2010.05.26

That warning came as South Korea's navy conducted anti-submarine warfare drills off its west coast.

VOA: standard.2010.05.27

regularly conduct drills to prepare for disaster.

VOA: standard.2010.03.30