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51. | periodic epidemic |
| 周期性流行 |
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52. | epidemic curves |
| 流行曲线 |
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53. | be in/come into vogue |
| 流行[流行起来] |
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54. | popular in the (whole) world |
| 全球流行 |
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55. | be out of vogue |
| 已不流行 |
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56. | a prevailing practice |
| 流行惯例。 |
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57. | popular dance |
| 流行舞 |
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58. | Pop music altar |
| 流行乐坛 |
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59. | a cholera epidemic |
| 霍乱流行. |
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60. | epidemic factor |
| 流行因素 |
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