- 弱: weak; feeble
- 演变: develop; evolve; evolution
- 演变: develop; evolve; evolution 从猿演变到人 evolve from ape to man; 社会的演变 social evolution; 追溯一个词在词义上的演变 trace the sense development of a word
- 渐弱演奏: diminuendo
- 病演变: disease-process
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