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51. | Lungs retain relatively insoluble particulate material. |
| 肺脏内留有不溶解的颗粒物质。 |
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52. | Americans retain a strong prudish streak. |
| 美国人保留着一种强烈的假正经的倾向。 |
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53. | retain a portion of foreign exchange |
| 留成外汇 |
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54. | Remember to carry out your promise. |
| 记住要履行诺言。 |
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55. | Retain a portion (of profits etc) |
| 留成 |
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56. | Please retain your ticket for inspection |
| 请保管好车票待检 |
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57. | receive into the mind and retain. |
| 接受了某种理念并保留在心。 |
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58. | used informally; unable to retain urine. |
| 非正式用法;不能留住尿。 |
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59. | a wall to retain the lake |
| 挡住湖水的堤坝 |
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60. | By heart; from memory |
| 记住;熟记;背诵 |
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