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| 41. | ignition timing control system |
| 点火时刻控制系统 |
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| 42. | occultation time |
| 掩食时刻 |
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| 43. | optimum time of burst |
| 最佳爆炸时刻 |
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| 44. | an opportune moment |
| 适当的时刻 |
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| 45. | time of perihelion passage |
| 过近日点时刻 |
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| 46. | time of occurrence |
| 发生时刻; 潜伏期 |
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| 47. | an arrivalsindicator |
| 到达时刻指示牌. |
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| 48. | In crisis, become as one. |
| 危急时刻，团结一致 |
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| 49. | early finish date |
| 最早结束时刻 |
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| 50. | busy time of line |
| 线路占用时刻 |
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