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51. | abrupt tooth engagement |
| 齿轮急剧啮合 |
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52. | a minor engagement |
| 小规模交火 |
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53. | Contract of engagement |
| 雇佣合同 |
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54. | crossing swords | engagement |
| 剑之交锋 |
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55. | engagement of head |
| 胎头入盆 |
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56. | positive engagement brake |
| 刚性连接式制动器 |
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57. | electrical engagement length |
| 电啮合长度 |
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58. | engagement of crew |
| 雇用船员 |
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59. | theory of engagement |
| 啮合原理 |
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60. | minimum engagement altitude |
| 最小接通高|原子爆炸最低允许高度 |
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