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51. | Prompt action is necessary. |
| 应马上采取措施。 |
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52. | "All night, if necessary. |
| “整整一夜,如果有必要的话。 |
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53. | sufficient and necessary condition |
| 充分必要条件 |
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54. | a (very) necessary book |
| 一本(很)必要的书 |
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55. | Necessary innovations and abolishments |
| 应兴应革 |
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56. | We'll take necessary precautions. |
| 我们会采取必要的预防措施。 |
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-- 来源 -- 疯狂英语流畅美语旅游口语专训 - 9 Service Complaints |
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57. | Repeat hourly if necessary. |
| 必要时每小时擦一次。 |
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58. | experience in ... is necessary |
| 须有..的经验 |
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59. | No bowing is necessary. |
| 你不需要鞠躬, |
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-- 来源 -- 中级美语(下)(二) - Lesson 127 Smile, Everybody! |
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60. | Thus, translation is necessary. |
| 因此需要翻译。 |
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