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| 61. | proper concave function |
| 正常凹函数 |
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| 62. | spoon of the blade |
| 叶片凹边 |
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| 63. | cutting edge of die |
| 凹模刃口 |
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| 64. | strictly concave function |
| 严格凹函数 |
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| 65. | photogravure proofing machine |
| 凹印打样机 |
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| 66. | anemocoelous vertebra |
| 异凹椎 |
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| 67. | area of ball imprint |
| 球凹面积 |
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| 68. | well deck vessel |
| 凹甲板船 |
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| 69. | double cup wheel |
| 双面凹砂轮 |
|
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| 70. | recessed plate press |
| 凹板式压滤机 |
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