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| 21. | Violent winds periodically drive clouds of dust around Mars. |
| 狂风间歇地席卷火星上的尘云。 |
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| 22. | Periodically clean the machine throughout the period of use. |
| 缝纫机的使用期间应定期进行清扫。 |
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| 23. | Note: When furnished with a strainer, flush periodically. |
| 注：如果配置过滤器，则要定期冲洗。 |
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| 24. | Are systems and audit results periodically reviewed by management? |
| 管理层是否定期查看所有的体系及审查结果? |
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| 25. | Periodically, Churchill sinks into spells of depression. |
| 邱吉尔的情绪会周期性落入低潮。 |
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| 26. | Inspectors periodically check wiring, heating plants and chimneys. |
| 检查员定期检查电线系统，暖气设备和烟囱。 |
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| 27. | These factories are periodically inspected by government officials. |
| 这些工厂由政府官员定期检查。 |
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| 28. | "Sets the lifetime of the balloon displayed periodically reminding" |
| "设置提醒气球的存留时间，以提醒用户" |
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| 29. | The maximum absolute value of a periodically varying quantity. |
| 振幅周期性变量的最大绝对值 |
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| 30. | a single complete execution of a periodically repeated phenomenon. |
| 定期重复现象的一次完整运行。 |
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