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51. | width of wheel tread |
| 轮缘踏面宽度 |
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52. | tread as on eggs |
| 如履薄冰|瞻前顾后 |
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53. | tread on delicate ground |
| 触及微妙的问题|碰到棘手问题|小心翼翼|如履薄冰 |
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54. | tread on the juice |
| 加快车等的速度 |
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55. | tread a dangerous path |
| 踏上危险的道路 |
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56. | To tread in air |
| 得意洋洋 |
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57. | with a measured tread |
| 以缓慢而匀称的步伐 |
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58. | Wheel tread (front/rear) |
| 轮距(前/后) |
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59. | dual purpose tread pattern |
| 混合花纹 |
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60. | transition rubber of tread |
| 胎面过渡胶 |
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