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How many does people discover the external galaxy having?
人们发现河外星系有多少个？
youdao
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Radio galaxy is also a strong red external source and X-ray source.
射电星系同时也是强的红外源和X射线源。
youdao
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Radio galaxy is also a strong red external source and X-ray source.
射电星系同时也是强的红外源和X射线源。
youdao