通过示波器观察光拍现象，可以帮助学生更好地理解多普勒效应，了解激光多普勒效应的应用。

Through observing the light beat on oscilloscope, the student can understand the laser Doppler effect and its application.

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曾经有一个男子请求我为他和他临终的父亲拍一张合影，我利用自然光为他们拍了照。

Once a man asked to have his photo with his dying father, and I photographed them in natural light.

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没有光，我们什么都看不见，相机也什么都拍不到。

Without light, both we and our cameras are blind.

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So this is an example of Biomedical Engineering, one that is well integrated into our society to the point that we've probably all got a picture like this somewhere in our past, and where we understand the physical principles that allow us to use it.

故而,这成为生物医学工程的一个实例,这类技术已经很好的融入了我们的社会,因为也许我们每个人都拍过,这样的X光片,正是因为我们懂得了,相应的物理学原理才能去运用这项技术

耶鲁公开课 - 生物医学工程探索课程节选