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| concavity | |||
| cup | |||
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| concave | |||
| 成凹形: 31 phrases in 13 subjects |
| Agriculture | 1 |
| Art | 1 |
| Automobiles | 5 |
| Aviation | 1 |
| Dermatology | 2 |
| Drilling | 1 |
| Engineering geology | 1 |
| General | 10 |
| Measuring instruments | 1 |
| Slang | 1 |
| Sports | 1 |
| Technology | 5 |
| Textile industry | 1 |
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