名词
中文翻译：Unknown
同义词：
['group formation', 'aggregation', 'assemblage']
例句：
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1. Thecluster formation of the birds is fascinating to watch.
鸟群的形成令人着迷。
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2. The formation of this group was due to a lack of resources.
这个群体的形成是由于资源匮乏。
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3. The aggregation of people around the campfire is a common sight during camping trips.
篝火周围的人群聚集是露营旅行中常见的景象。