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复合线
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复合线
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复合线
释
recombination line
复合线
在气体星云和其他一些天体的光谱中出现的氢、氦等元素的容许谱线(见禁线)的发射线。
Astronomy
recombination line
复合线
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rural livelihood diversification
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Rural Opera Performance on a Winter Day
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