Rail track geometric irregularities are the concrete embodiment of track structuredeterioration, and give an expression to the comprehensive performance of track members.
轨道几何平顺状态是轨道结构部件综合性能的表现，直接反映了轨道质量状态的优劣。
2
Keratoconus is a deterioration of the structure of the cornea with gradual bulging from the normal shape to a cone shape.
圆锥角膜是一种角膜的结构退化，病发时患者角膜由正常情况下的圆形逐渐鼓胀成圆锥形。
3
The function of water will exacerbate the destruction of pavement structure, speed up the deterioration of pavement performance and shorten the life of the road.