| 单词 | 背线 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔extrados〕The upper or exterior curve of an arch.拱背线：拱顶上面或外缘的曲形线美国传统 |
英语例句辞典收录了559068条英语例句在线翻译词条，基本涵盖了全部常用单词及词组的例句翻译及用法，是英语学习的有利工具。
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“背线”例句
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