The team chose 140 active galactic nuclei, or AGNs, by selecting galaxies that emit a lot of X-rays, which can Pierce the galactic gas and dust that might otherwise block the nuclei from view.
课题小组选择了140个活动星系核，或简称agns，这些星系都放射出大量的X射线，X射线能穿透阻挡观测的气体和尘埃。
The team chose 140 active galactic nuclei, or AGNs, by selecting galaxies that emit a lot of X-rays, which can Pierce the galactic gas and dust that might otherwise block the nuclei from view.
课题小组选择了140个活动星系核，或简称agns，这些星系都放射出大量的X射线，X射线能穿透阻挡观测的气体和尘埃。
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