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71. | You've no reason to fret. |
| 你不必担心。 |
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72. | We need not be busy. |
| 我们不必忙。 |
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73. | That won't be necessary. |
| 这就不必了。 |
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74. | "Thank you very much.""Not at all." |
| 不必客气。 |
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75. | You don't have to hurry. |
| 你不必赶。 |
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76. | There will be no school tomorrow. |
| 明天不必上学。 |
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77. | let us make haste slowly. |
| 我们不必赶快。 |
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78. | He need not know. |
| 他不必知道。 |
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79. | Keep the change. |
| 不必找钱了。 |
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80. | In no hurry to leave. |
| 不必着急离开 |
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