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

Further down the line, for example, in the blastocyst I talked about before, we could obtain cells from this inner cell mass or this cluster of cells that becomes the embryo.

沿着这条线看,举个例子,就是我之前提到过的囊胚,我们可以取一些内细胞群的细胞,这种能成为胚胎的细胞群

耶鲁公开课 - 生物医学工程探索课程节选

The Cleveland Clinic in Ohio says the cluster headache can be many times more intense than a migraine.

VOA: special.2010.03.30

They cluster in that way.

也能组成一个集合。

耶鲁公开课 - 文学理论导论课程节选

Cluster headaches occur in cycles: sufferers can experience several headaches a day for weeks or even months on end.

VOA: standard.2009.12.17

"Our study showed for the first time a clear difference between oxygen and air in the treatment of acute cluster headache.

VOA: standard.2009.12.17

Dr.Peter Goadsby of the University of California and other researchers followed The doctors treated for cluster headaches in each patient using air and oxygen in separate trials.

VOA: standard.2009.12.17