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41. | line-of-sight direction |
| 视线方向 |
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42. | geometry of directio |
| 方向几何 |
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43. | great circle direction |
| 大圆方向 |
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44. | direction of search |
| 搜索方向 |
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45. | direction of traffic |
| 行车方向 |
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46. | direction of fall |
| 下坡方向 |
|
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47. | incidence direction |
| 入射方向 |
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48. | direction of tractio |
| 牵引方向 |
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49. | Direction Chaos |
| 方向混乱 |
|
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50. | Direction prohibited |
| 禁止方向 |
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