英语词汇“拱背线”的中英文读音、翻译、固定搭配用法、短语词组及例句-英汉汉英双解词典-四方网

单词	拱背线
释义	〔extrados〕The upper or exterior curve of an arch.拱背线：拱顶上面或外缘的曲形线
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