- degradation
- 退化: become vestigial; degenerate ...
- 降: surrender; capitulate
- 退化，降[减]低，减少，降格[级]，老[软]化: degradation
- 降: 降动词1.(投降) surrender; capitulate 宁死不降 rather die than surrender2.(降伏) subdue; vanquish; tame 一物降一物。 there is always one thing to conquer [overcome] another.
- 降a: a flat
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