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51. | terrain clearance altimeter |
| 真高高度表 |
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52. | rock-free terrain |
| 无石地区 |
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53. | a terrain reconnaissance |
| 地形侦察 |
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54. | Terrain Compound Object |
| 地形合成物体 |
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55. | earth terrain camera |
| 地表摄象机 |
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56. | off-road terrain |
| 越野地带 |
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57. | digital terrain file |
| 数字地形文件 |
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58. | terrain clearance indicator |
| 绝对测高计|无线电测高计 |
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59. | all terrain carrier |
| 全道路运输车 |
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60. | terrain-following flight |
| 地形跟踪飞行 |
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