| 单词 | 拱背 |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔arch〕The cat arched its back in anger.那只猫愤怒地拱背成弓形。文馨英汉〔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He had become round-shouldered from years of sitting in front of a computer.由于多年坐在计算机前，他变得拱背曲肩。剑桥国际 |
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