视频对白:

We can see the cluster of hostages.
我们能看到人质的聚集群。

cluster

n.丛；簇，串；群

Cluster munitions, explosive weapons that scatter bomblets across a wide area.
集束弹药是散落在较广区域的小炸弹等爆炸性武器。

One tactic the investigators decry is the use of the "patent cluster".
调查人员所谴责的伎俩之一就是“专利集束”的使用。