90年代后期更出现了产业结构退化现象。

In the late 1990s, the industrial structure even degenerated.

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结论去负荷导致骨显微结构退化，骨局部因子含量改变，骨强度和骨量减少。

Conclusion Hindlimb unloading may lead to regression of bone microstructure, change of bone local growth factor content, reduction of bone biomechanical properties and bone content.

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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。

Keratoconus is a deterioration of the structure of the cornea with gradual bulging from the normal shape to a cone shape.

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So, in a sense, the tax structure was regressive.

在某种意义上,这种税制结构是退化的

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