Another is that they're extremely rare, forming only in the densest star clusters.
另一个原因是它们非常稀少，只在最密集的恒星群中才有。
Previous studies have shown that this is the closest of the so-called super star clusters.
之前的研究已经显示这是离我们最近的被称之为“巨星团”的天体。
Previous studies have shown that this is the closest of the so-called super star clusters.
之前的研究已经显示这是离我们最近的被称之为“巨星团”的天体。
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