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| 21. | absolutely useless |
| 纯粹是徒劳 |
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| 22. | reactive energy meter[varhour meter] |
| 无功电度表[乏时计] |
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| 23. | absolute refractory period |
| 绝对不应期;绝对不应期;绝对乏奋期;绝对乏奋期 |
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| 24. | completely useless |
| 全然徒劳无益的 |
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| 25. | Useless materials |
| 栎散之质 |
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| 26. | useless without |
| 没有…就没有用了 |
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| 27. | useless reserves |
| 表外储量 |
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| 28. | certainly useless |
| 必然是无益的 |
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| 29. | Useless Information? |
| 无用的信息? |
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| 30. | useless arguing |
| 没有用的辩论 |
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