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| 51. | ground service plug |
| 地面电源插头 |
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| 52. | ground early-warning |
| 地面预警 |
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| 53. | ground level concentration |
| 地面浓度 |
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| 54. | state of ground |
| 地面状况 |
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| 55. | ground navigation aid |
| 地面导航系统 |
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| 56. | ground observation post |
| 地面观测站 |
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| 57. | ground-reflection coefficient |
| 地面反射系数 |
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| 58. | ground surface measurement |
| 地面度量 |
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| 59. | ground lighting facilities |
| 地面灯光设备 |
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| 60. | above ground structure |
| 地面建筑物 |
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