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| 51. | circumferential notch |
| 圆形缺口|圆周槽口 |
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| 52. | A toothlike part or projection. |
| 齿状部件或缺口 |
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| 53. | notch bar impact strength |
| 有缺口冲击值 |
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| 54. | nicks in a razor |
| 剃刀上的缺口 |
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| 55. | notch impact strength |
| 缺口冲煌度 |
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| 56. | a nick in the edge of a plate |
| 盘子边上的缺口 |
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| 57. | notch impact test |
| 缺口冲辉验 |
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| 58. | suprasquamosal indentation |
| 鳞骨上缺口 |
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| 59. | angle-notched disk |
| 尖角缺口圆盘 |
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| 60. | heel tooth notch |
| 边齿三角缺口 |
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