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31. | aeroplane heading |
| 机头方向 |
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32. | Direction of Pressing |
| 熨烫方向 |
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33. | vertical direction |
| 垂直方向 |
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34. | directional derivative |
| 方向导数 |
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35. | tracking direction |
| 跟踪方向 |
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36. | bearing of trend |
| 延伸方向 |
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37. | usable direction |
| 可用方向 |
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38. | in a northwestward direction |
| 朝西北方向 |
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39. | useful direction |
| 有效方向 |
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40. | direction of operation |
| 作战方向 |
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