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