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81. | line-of-sight direction |
| 视线方向 |
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82. | bearing of trend |
| 延伸方向 |
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83. | geometry of directio |
| 方向几何 |
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84. | aeroplane heading |
| 机头方向 |
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85. | in a northwestward direction |
| 朝西北方向 |
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86. | incidence direction |
| 入射方向 |
|
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87. | directional derivative |
| 方向导数 |
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88. | great circle direction |
| 大圆方向 |
|
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89. | direction of operation |
| 作战方向 |
|
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90. | Direction Chaos |
| 方向混乱 |
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