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| 21. | Day and night cannot dwell together. |
| 白昼与黑夜不能同时在一起。 |
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| 22. | The machines run day and night. |
| 机器日夜不停地转动。 |
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| 23. | he practiced Chopin day and night. |
| 他整天练习肖邦音乐。 |
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| 24. | He's plodding away day and night. |
| 他一天到晚在勤苦工作。 |
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| 25. | The machinery operates day and night. |
| 机器日夜运转。 |
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| 26. | as difference as day and night. |
| 黑白分明(天壤之别) |
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| 27. | They study hard day and night. |
| 他们白天黑夜地学习。 |
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| 28. | day and night (=all the time) |
| 昼夜；终日 |
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| 29. | to work indefatigably day and night |
| 日夜操劳 |
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| 30. | They make him working day and night . |
| 他们支使他日以继夜地工作。 |
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