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| 51. | rock-free terrain |
| 无石地区 |
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| 52. | terrain-following system |
| 地形跟踪系统 |
|
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| 53. | synoptic terrain photography |
| 地表概要摄影术 |
|
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| 54. | earth terrain camera |
| 地表摄象机 |
|
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| 55. | digital terrain data |
| 数字地形资料 |
|
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| 56. | natural terrain obstacles |
| 天然障碍物 |
|
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| 57. | Terrain-avoidance radar |
| 地形回避雷达 |
|
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| 58. | a terrain reconnaissance |
| 地形侦察 |
|
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| 59. | Terrain-avoidance information |
| 地形回避信息 |
|
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| 60. | digital terrain file |
| 数字地形文件 |
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