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| 凹曲线 | |||
| 下凹〔阶梯〕曲线 | |||
| 下凹曲线; 阶梯形曲线; 切口曲线; 下凹垂线; 刻凹槽的曲线 | |||
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notching curve : 1 phrase in 1 subject |
| Textile industry | 1 |
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