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David, you're a scientist at the sleep laboratory.
大卫，你是睡眠实验室的科学家吧。
Yes, I am.
是的，我是。
Why do you study sleep?
你为什么研究睡眠？
Because sleep is important. In some jobs, people work a lot of hours.
因为睡眠很重要。对于某些工作，人们要工作很长时间。
For example, police officers often work 12 hours. They are tired at work.
例如，警察经常工作12小时，工作让他们很疲惫。
They can't sleep. We can help people.
他们无法睡着，我们可以帮助人们。
But we don't understand sleep well.
但是我们不太了解睡眠。
Okay, and how do you study sleep?
好吧，你们怎么研究睡眠？
People come to our laboratory. They sleep and we watch them.
人们来到我们的实验室，他们睡觉，我们观察他们。
Do you do experiments?
你们做实验吗？
Yes, we do. For example, we change the light.
是的，我们做。例如，我们改变灯光。
We use different colours of light, blue light and red light.
我们使用不同颜色的光，蓝光和红光。
And what are the results with different colours?
不同颜色会有什么结果？
Well, red light usually wakes people up.
嗯，红灯通常会让人醒来。
So, is blue light good for tired people at work?
那么，蓝光对工作疲劳的人有好处吗？
Possibly, we aren't sure. We don't understand how it works.
可能，我们不确定，我们不明白它是如何运作的。
Okay, David, thank you very much.
好吧，大卫，非常感谢。
You're welcome.
不客气。
