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| 51. | Satellites orbiting round the earth have provided scientists with a vast amount of information about conditions in outer space. |
| 环绕地球运行的人造卫星为科学家们提供了大量有关外层空间情况的资料。 |
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| 52. | operating ambient |
| 运行环境 |
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| 53. | 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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| 54. | exploratory run |
| 探索性运行 |
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| 55. | trouble-free operation |
| 无干扰运行;连续工作;顺利运行 |
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| 56. | generator operation |
| 发电机运行 |
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| 57. | Analyze client equipment and operations to determine servicing and supply needs. |
| 对客户的设备及其运行情况进行分析，以决定提供何种服务和物品。 |
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| 58. | full circulating operation |
| 大循环运行 |
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| 59. | 3、 屏蔽层在零序工作状态下的电抗值低，有利于新型短路自动保护设备的应用，有利于电缆及其相关设备的安全运行。 |
| The reactance of the shield in the zero sequence state is low, which is helpful for the application of new type automatic protecting equipment with short circuit, and the safe running of the cable and other relative equipment. |
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| 60. | locomotive in service |
| 运行机车 |
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