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41. | in the ton |
| 在流行 |
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42. | be the craze |
| 大流行 |
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43. | in vogue; in style |
| 流行的 |
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44. | plant disease epidemic |
| 植物病害流行 |
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45. | prevalence of disease |
| 疾病流行 |
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46. | cholera epidemic |
| 霍乱流行 |
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47. | epidemiological process |
| 流行过程 |
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48. | popular in the world |
| 全球流行 |
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49. | generally prevail |
| 普遍流行 |
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50. | bring into fashion |
| 使流行 |
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