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| 41. | unstable stability |
| 负稳定法|不稳定性 |
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| 42. | unstable hydrocarbon |
| 不稳定烃 |
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| 43. | unstable lubrication |
| 非永久润滑 |
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| 44. | unstable share prices |
| 变化莫测的股票价格 |
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| 45. | unstable mineral |
| 不稳定矿物 |
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| 46. | unstable protobitume |
| 不稳定原沥青 |
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| 47. | unstable nucleus |
| 不稳定核 |
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| 48. | Very unstable |
| 摇摇欲坠 |
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| 49. | unstable oscillation |
| 不稳定振荡 |
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| 50. | an unstaBle ladder. |
| 一个摇摇晃晃的梯子 |
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