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| concave-up; concave-upward | |||
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上 凹 的 : 25 phrases in 8 subjects |
| Architecture | 4 |
| Automobiles | 2 |
| Aviation | 1 |
| Environment | 1 |
| General | 6 |
| Polygraphy | 1 |
| Technology | 9 |
| Textile industry | 1 |
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