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| 81. | concave clearance |
| 凹板间隙 |
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| 82. | excavation of optic disc |
| 视盘陷凹 |
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| 83. | engraved copper plate |
| 雕刻凹铜版 |
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| 84. | concave head piston |
| 凹顶活塞 |
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| 85. | waning development |
| 凹坡发育 |
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| 86. | concave bottom mill |
| 凹底铣鞋 |
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| 87. | embossed cotton printed |
| 凹凸纹印花布 |
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| 88. | concave closure |
| 凹闭包 |
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| 89. | indented packing paper |
| 压凹包装纸 |
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| 90. | hollow base cartridge |
| 底凹弹 |
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