vowel devoicing 元音失读
devoicing rule 清音化规则
image devoicing 图像去噪
initial devoicing 浊音清化
final devoicing 清音化
V to make (a voiced speech sound) voiceless (使浊音)变清音 [phonetics]
Through the processes of devoicing and weakening, these initials evolve respectively in the places and the ways of pronunciation in terms of the tones, initials and finals.
益阳方言的古全浊声母根据声调、声母、韵母进行不同层级的演变，演变按照清化和弱化两种模式进行。
But voiced obstruent devoicing in Wuyu is not an individual phenomenon. In dialects of Jinhua and Quzhou, nominally voiced obstruents can not uncommonly be recorded as voiceless on sets.
但全浊声母清化在吴语里已不是个别现象，金华、衢州一带方言的所谓全浊声母不少也可以记作清声母。
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