loosely bound短语¹⁴⁴⁹⁷²⁺² 基本例句 松弛结合 Many galaxies are gravitationally bound together to form clusters, which themselves are loosely bound into superclusters, which in turn are sometimes seen to align over even larger scale structures. 许多星系都由于引力而联系在一起，成为星系团，而星群则和超星系团松散地联系在一起，而超星系团则在更大的尺度范围内有着并排排列的结构。 yeeyan