狭窄部分

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狭窄的英语翻译：

straitness; stricture
【医】 angusty; constriction; fretum; stegnosis; steno-; stenochoria; stenosis
stricture

部分的英语翻译：

part; section; portion; proportion; sect; segment; share
【计】 division; element
【医】 binary division; fraction; mero-; pars; part; Partes; portio; portiones