Harvest the center flower-bud cluster of broccoli when it reaches the size you want and while the buds are still tightly together.

VOA: special.2010.03.09

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

It was properly powered,randomized and placebo-controlled and really provides evidence for the use of oxygen in cluster headaches,"

VOA: standard.2009.12.17