英语词汇extrados怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	extrados
释义	extrados/ikˈstreidɒs, ek-/n. Archit. the upper or outer curve of an arch (opp. 反义 INTRADOS) 【建】拱背，拱的外缘线 [as EXTRA- + French dos ‘back’ from Latin dorsum]
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