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| 21. | concave mapping |
| 凹映射 |
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| 22. | concave function |
| 凹函数 |
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| 23. | concave sequence |
| 凹序列 |
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| 24. | male and fomale(M&F) |
| 凹凸面 |
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| 25. | concave spherical mirror |
| 凹球面镜 |
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| 26. | fovea triangularis |
| 三角凹 |
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| 27. | facial depression |
| 触角凹 |
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| 28. | concave polygon |
| 凹多边形 |
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| 29. | embossing plate |
| 凹凸版 |
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| 30. | shrinkage pool |
| 凹孔 |
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