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71. | I can't be sure. |
| 我不能肯定。 |
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72. | I don't know for certain. |
| 我无法肯定。 |
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73. | affirmative acknowledge |
| 肯定的确认 |
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74. | universal affirmative judgment |
| 全称肯定判断 |
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75. | It's a mathematical certainty. |
| 这事绝对肯定。 |
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76. | I can't say for certain. |
| 我不能肯定。 |
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77. | as sure as death |
| 肯定无疑|必然 |
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78. | particular affirmative proposition |
| 特称肯定命题 |
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79. | I be absolutely positive . |
| 我完全可以肯定. |
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80. | We affirmed that practice was the sole criterion for judging truth. |
| 肯定了实践是检验真理的唯一标准, |
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