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51. | mountain racing |
| 山地比赛 |
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52. | road racing |
| (汽车或摩托车的)公路赛 |
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53. | motor racing |
| 汽车运动 |
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54. | The motor engine raced before it was shut off. |
| 汽车发动机关闭之前快速空转。 |
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55. | motorboat racing |
| 摩托艇运动 |
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56. | racing declaration |
| 竞赛声明 |
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57. | drag racing |
| 短程高速赛车 |
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58. | I stopped the car but left the motor ticking over. |
| 我停住汽车, 让发动机空转. |
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59. | competitive racing |
| 比赛测验训练法 |
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60. | vacuum drum filter |
| 真空转鼓吸滤机 |
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