The combination of very large radio flux and exceedingly small angular size means that the sources have a fantastic surface brightness.
极大的射电流量同极小的角经集于一身，意味着这些发射源有难以置信的高表面亮度。
The combination of very large radio flux and exceedingly small angular size means that the sources have a fantastic surface brightness.
极大的射电流量同极小的角经集于一身，意味着这些发射源有难以置信的高表面亮度。
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