名词
中文翻译：集合体
同义词：
['cluster', 'mass', 'aggregate']
例句：
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1. The scientists have discovered a new type of cluster in the galaxy.
科学家们发现了银河系中的一种新型群。
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2. The researchers found that the mass of the cluster was much larger than expected.
研究人员发现这个群的质量比预期的要大得多。
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3. The physicists were able to analyze the aggregate properties of the cluster.
物理学家能够分析这个群的聚合性质。