All the land tortoise species formed a tight cluster of points in the upper part of the triangle; all the water turtles cluster in the lower part of the triangular graph.

所有陆龟品种都在三角形的上部形成一个紧密的点群；所有的水龟都聚集在三角图的下方。

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If the center of NGC 4258 were a star cluster, the stars would be so closely spaced that collisions between individual stars would have long ago torn the cluster apart.

如果 NGC 4258 的中心是一个星团，恒星之间的距离会非常近，以至于在很久以前单个恒星之间的碰撞就会把星团撕裂。

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The Cleveland Clinic says the cause of cluster headaches is in a brain area known as a trigeminal-autonomic reflex pathway.

VOA: special.2010.03.30

The sheer cacophony of the clustered consonants in this line sets off -or has the potential to set off -- a powerful cluster of feelings.

这句诗中辅音全然不和谐，使人觉得,或者有意向让人觉得-，有力量的层叠之感。

耶鲁公开课 - 弥尔顿课程节选

Now, as I said last time, the subject of free will--or free will, determinism, causation and responsibility, this cluster of problems-- is an extremely difficult and complicated physical problem.

正如我上次所说的,自由意志这个主题 或者说自由意志,决定论,因果论,责任,这一堆问题,是极端困难和复杂的物理问题

耶鲁公开课 - 死亡课程节选

In other domestic news, the World Health Organization is watching out for mutations and possible human-to-human transmission of the new H7N9 bird flu strain after two family cluster cases - a father-and-son cluster and a husband-and-wife cluster - were detected in Shanghai, China Daily reports.

BBC: China media: Quake donations debate

More than that, fashion is just the sort of thing Britain is supposed to be good at in this post-industrial age: creative, high-value-added, cluster-based.

ECONOMIST: London Fashion Week

Like other recommendation engines, Baynote attempts to cluster consumers and understand what products or content interest each cluster in real-time.

FORBES: How Real-Time Marketing Technology Can Transform Your Business