That leaves 60% of people with malocclusion for unknown reasons.

那么还剩60%人咬合正原因知。

Yet, malocclusion with a known cause is listed as only 5% percent of the population.

但只有5%人造成咬合正原因已知。

He says such culinary adaptations resulted in fundamental changes in craniofacial growth and development, resulting in reduced robustness, increased malocclusion and increased tooth crowding.

他指出，此类厨房工具应用给人类颅面生长发育带来了根改变，这就导致了人类更加瘦弱，牙齿错位几率增加，牙腔变拥挤。

This is very striking considering according to Proffit's 1994 Contemporary Orthodontics, two-thirds of the US population has some degree of malocclusion — misalignment of the teeth.

根据Proffit1994年《当代正畸学》，这是非常惊人想法，因为三分之二美国人口都有同程度牙齿咬合正，也就是牙齿错位。