depressed semicircle是什么意思，depressed semicircle的翻译，depressed semicircle音标、读音、用法和例句

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depressed semicircle是什么意思，depressed semicircle的翻译，depressed semicircle音标、读音、用法和例句_沉淀汉英词典

depressed semicircle

基本解释

专业释义

土木建築工程