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| 31. | a vertical motion |
| 上下运动 |
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| 32. | To bob up and down. |
| 上下摆动 |
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| 33. | both upper and lower epidermal layers |
| 上下表皮层 |
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| 34. | perpendicular motion |
| 上下震动 |
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| 35. | up-down asymmetry |
| 上下不对称 |
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| 36. | vertical excitation |
| 上下激动 |
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| 37. | stare up and down |
| 上下打量 |
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| 38. | float up or down |
| 上下浮动 |
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| 39. | heaving and dipping |
| 上下起伏 |
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| 40. | top and bottom saw |
| 上下锯机 |
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