degradation
[degrada(ɑ)sjɔ̃]
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f.
降级，贬黜；损害，毁坏；堕落；(光线、色彩的)渐弱，渐变
Degradation
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abstract:
In geology, degradation refers to the lowering of a fluvial surface, such as a stream bed or floodplain, through erosional processes. It is the opposite of aggradation.
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WordNet