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21. | There are two kinds of drags, parasite drag and induced drag. |
| 阻力有两种:寄生阻力和诱导阻力。 |
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22. | multiple oppression |
| 重重压迫 |
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23. | She is beset with worries. |
| 她忧虑重重。 |
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24. | put in a Blow |
| 重重一击 |
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25. | wrestling with internal doubts |
| 疑虑重重心神不定. |
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26. | a sound slap |
| 重重的一巴掌 |
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27. | aerodynamic resistance |
| 空气动力阻力;气动阻力 |
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28. | He was beset by doubts. |
| 他疑虑重重。 |
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29. | alps on alps |
| 重重高山;重重难关 |
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30. | She was beset by doubts. |
| 她疑虑重重。 |
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