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| 21. | The machines run day and night. |
| 机器日夜不停地转动。 |
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| 22. | They ran the presses 24 hours a day. |
| 他们日夜开动印刷机。 |
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| 23. | The bus service runs day and night. |
| 公共汽车日夜都有班次。 |
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| 24. | all-night store | day-and-night store |
| 彻夜商店| 日夜商店 |
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| 25. | This machine operates night and day. |
| 这台机器日夜运转. |
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| 26. | The teacher worked night and day. |
| 教师日夜地工作。 |
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| 27. | Customers find the 24-hour service very convenient. |
| 日夜服务，顾客称便。 |
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| 28. | They attended day and night on the patient. |
| 他们日夜护理病人。 |
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| 29. | They tailed the suspect day and night. |
| 他们日夜追踪嫌疑犯。 |
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| 30. | Preparations proceeded night and day. |
| 准备工作在日夜进行。 |
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