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| 41. | barrier permeability |
| 屏障透过率 |
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| 42. | Democracy is a bulwark of freedom. |
| 民主是自由的保障. |
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| 43. | noise barrier |
| 隔声屏障 |
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| 44. | roadside barrier |
| 路旁隔音屏障 |
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| 45. | blood-cerebrospinal fluid barrier |
| 血－脑脊液屏障 |
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| 46. | fission product barrier |
| 裂变产物屏障 |
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| 47. | species barrier |
| 种间屏障 |
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| 48. | barrier [laser game] |
| 屏障〔激光游戏〕 |
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| 49. | hydraulic conductivity barrier |
| 水力传导屏障 |
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| 50. | blood-retina barrier |
| 血－视网膜屏障 |
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