incidence

近年来，这个地区的犯罪率有所上升。

The ___incidence of crime in this area has increased in recent years.

这个地区糖尿病的发病率比其他地方高很多。

The ___incidence of diabetes in this area is much higher than elsewhere.

工程师调整镜子的角度，以改变光束的入射角。

The engineer adjusted the mirror to change the ___incidence angle of the light beam.