比如用光谱仪看钠灯，两条典型谱线有确定的间隔。要是钠灯飞速远离，看到的间隔就会变大，从变化量可以算出飞离的速度。

来源: pop4 于 2026-02-19 17:00:22 [旧帖] [给我悄悄话] 本文已被阅读：次

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