clustering
柯林斯词典
1. N-COUNT A cluster of people or things is a small group of them close together. (人或物的) 群
...clusters of men in formal clothes. …几组身着正装的男人。
2. V-I If people cluster together, they gather together in a small group. (人) 结成群
The passengers clustered together in small groups. 乘客们聚集成小群体。
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