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| 81. | =====中国的古人根据太阳在两个冬至日之间的运行情况划定出一年；根据月亮圆而后缺，再由缺复圆的时间划分出12个月。 |
| The ancient Chinese started their calendar year in winter. Using the cycle of the moon, its waxing and waning, they devised the12 months-moons--of the year. |
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| 82. | operating ambient |
| 运行环境 |
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| 83. | Advisory Committee for Operational Hydrology |
| 运行水文学咨询委员会（运行水文咨委会） |
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| 84. | generator operation |
| 发电机运行 |
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| 85. | fail safe operation |
| 安全运行 |
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| 86. | full circulating operation |
| 大循环运行 |
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| 87. | trouble-free operation |
| 无干扰运行;连续工作;顺利运行 |
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| 88. | locomotive in service |
| 运行机车 |
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| 89. | exploratory run |
| 探索性运行 |
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| 90. | pressure operation |
| 增压运行 |
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