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31. | inverted siphon |
| 倒虹吸管 |
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32. | Back Stitching |
| 倒钩针 |
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33. | backward roll | backward somersault |
| 倒筋斗 |
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34. | Backward skating |
| 倒滑 |
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35. | (of a bicycle, etc.) a back-pedal brake; a coaster brake |
| 倒煞车 |
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36. | reciprocal value |
| 倒数值 |
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37. | rotation-inversion axis |
| 倒转轴 |
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38. | inverted speech |
| 倒语言 |
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39. | reciprocal bearing |
| 倒方位 |
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40. | double-shift work |
| 两班倒 |
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