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| 21. | Our boss alternates kindness with severity. |
| 我们的老板时而和蔼,时而严厉。 |
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| 22. | All year she has fluctuated between optimism and despair. |
| 全年当中她时而乐观,时而消沉。 |
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| 23. | Neely alternated between anger and fright. |
| 尼利时而发怒，时而害怕。 |
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| 24. | In groups of two to three, they appear careful in deciding what they will buy and are often seen chatting among themselves. |
| 他们三三两两，时而小声商量，时而认真挑 |
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| 25. | His action was alternatively vivacious and sullen. |
| 他的举动时而轻松愉快，时而阴沉古怪。 |
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| 26. | now and then |
| 时而,不时 |
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| 27. | The long necks were lifted and curved down, again and again, it went on for a long time. |
| 长长的脖子时而抬起，时而弯下，一次又一次。 |
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| 28. | His action was alternately vivacious and sullen |
| 他的举动时而轻松活泼，时而郁闷不乐。 |
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| 29. | She vacillated between hope and fear. |
| 她时而抱有希望, 时而心存恐惧. |
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| 30. | Owen was alternately dejected and maddened by the knowledge of his own helplessness. |
| 欧文因自己一筹莫展，时而烦闷，时而生气。 |
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