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 law of talion, which is essentially the principle that a person should be punished according to the injury they inflicted, it's been decried as a primitive, archaic reflex of the vengeance or vendetta principle.

复仇法，本质上讲述了人应该根据其所造成的伤害,接受处罚的原则，却遭到了谴责，人们认为它是,复仇或仇杀原则原始古老的反映。

耶鲁公开课 - 旧约导论课程节选

But with children,he says, once they learn something, it can become a reflex.

VOA: standard.2010.04.01

This reflex occurs because our skin ridges signal that the object is about to fall.

CNN: Fingerprint study offers inspiration for robotics research

The latest hand-wringing about Pentagon cuts reflects what is now a deep-seated reflex among industry executives.

FORBES: GOP Electoral Victory In 2012 Could Rescue Defense Industry

Koepp's idea of romance involves mummified corpses, dental forensics and Bertram's sensitive gag reflex.

CNN: Review: Gervais gives edge to 'Ghost Town'