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| 31. | usable direction |
| 可用方向 |
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| 32. | forward direction |
| 正向 |
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| 33. | vertical direction |
| 垂直方向 |
|
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| 34. | negative direction |
| 逆向, 反方向 |
|
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| 35. | tracking direction |
| 跟踪方向 |
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| 36. | direction key |
| 方向键 |
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| 37. | traffic direction |
| 交通流向；交通流动方向 |
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| 38. | useful direction |
| 有效方向 |
|
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| 39. | trailing direction |
| 背向 |
|
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| 40. | incidence direction |
| 入射方向 |
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