“声谱图”一词是从光学借来的。

The term "spectrogram" is borrowed from optics .

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另外，NIST还发现可以从光学频率梳产生非常稳定的微波信号。

In addition, NIST has shown that extremely stable microwave signals can be generated from optical frequency combs.

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如果您戴眼镜，您就会知道，从光学的层面理解，焦点的意思是，将光线汇聚到您眼底的一点上。

If you have glasses you know that optically focus has to do with bringing the light to a focal point in the back of your eye.

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