xkcd

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XKCD中文站,一个关于浪漫、隐喻、数字、以及语言的线上漫画。

Doppler Effect

中文翻译
Doppler Effect
The Doppler effect is a mysterious wavelength-shifting phenomenon which seems to primarily affect sirens, which is why the ???? emoji is red.

中文翻译 原文链接