多普勒效应
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doppler ' s effect 多普勒效应
doppler s effect
以上为机器翻译结果，长、整句建议使用 人工翻译 。
This is a reddening of a galaxy's spectrum caused by the Doppler effect (the effect that causes a police-car siren to drop in pitch as the car drives away).
ECONOMIST: Astronomy
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