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人们对河外水脉泽的观测与研究已经30年了。目前已经在约70个河外星系中检测到水脉泽辐射(已公开发表64个)。近年来,河外水脉泽的观测......
It has long remained an open question as to the geometry of the broad line region (BLR) in active galactic nuclei (AGNs)......