High-mass SFR masers with VLBI & external MW-like gal.
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In spite of much work, the overall spiral structure morphology of the Milky Way remains somewhat uncertain. In the last two decades, accurate distance measurements have provided...
尽管已有诸多相关研究，银河系的整体螺旋结构形态仍存在一定不确定性。近二十年来，精确的距离测量已为……
