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51. | flight direction |
| 飞行方向 |
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52. | prime direction |
| 起始方向 |
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53. | guardianship direction |
| 监护指示 |
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54. | normal direction |
| 法线方向 |
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55. | grain direction |
| 纹理方向 |
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56. | fracture direction |
| 裂缝方向 |
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57. | fibre direction |
| 纤维方向 |
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58. | artistic direction |
| 艺术方针 |
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59. | field direction |
| 磁场方向 |
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60. | offset direction |
| 偏离航向;偏移方向 |
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