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51. | A stronghold or fortified place;a bulwark. |
| 要塞一个坚固或得到加固的地方;堡垒 |
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52. | capillary end barrier |
| 毛细管末端屏障 |
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53. | blood-air barrier |
| 血-气屏障 |
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54. | A means of protection or defense; a bulwark. |
| 保护保护或防御的方法;保障 |
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55. | blood-brain barrier |
| 血-脑屏障 |
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56. | blood-eye barrier |
| 血眼屏障 |
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57. | natural noise barrier |
| 天然噪音屏障 |
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58. | Spruance lounged outside, elbows on the bulwark. |
| 斯普鲁恩斯在外边闲望,胳膊肘搁在舷樯上。 |
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59. | blood-thymus barrier |
| 血-胸腺屏障 |
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60. | The navy is our principal bulwark against invasion. |
| 海军是我们抵御侵略者的重要保障。 |
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