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81. | at a certain speed |
| 以一定的速度 |
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82. | give a certain impression |
| 给予某种印象 |
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83. | have certain good qualities |
| 有某些优点 |
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84. | state of being certain |
| 确知;确信;确实;必然 |
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85. | a certain number of |
| 一定数的 |
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86. | of a certain age |
| 不算年轻了|中年的 |
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87. | take a certain direction |
| 朝某方向 |
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88. | on a certain scale |
| 按某种比例 |
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89. | certain varieties of soybea |
| 某些大豆品种 |
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90. | I'm certain about it. |
| 我对这件事很有把握。 |
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