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71. | "Engagement" and "Openness" |
| “契约”和“开放” |
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72. | length of engagement |
| 啮合长度 |
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73. | a pressing engagement |
| 急迫的约会. |
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74. | stipulated time |
| 约定期限 |
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75. | line of engagement |
| 接触线;啮合线 |
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76. | angle of engagement |
| 啮合角 |
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77. | depth of engagement |
| 接合深度;啮合深度 |
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78. | stipulated price |
| 约定价格 |
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79. | tip edge engagement |
| 顶缘啮合 |
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80. | default convention |
| 缺省约定 |
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