- 双语例句
1、
Spiral galaxies are considered to be gravitationally bound configurations of stars.
旋涡星系被认为是由恒星组成的引力束缚系统.
辞典例句
2、
Star clusters are groups of stars which are gravitationally bound.
星团是星体依靠重力作用附着在一起而构成的.
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