单词：natural epidemic focus
natural epidemic focus的用法和样例：
例句
- As one of the oldest identifiable diseases known to man, plague remains endemic in many natural loci around the world.鼠疫作为人所共知的一种最古老可确定的疾病，在世界上许多自然疫源地仍呈地方性流行。
- Conclusion The findings of the present study imply that the natural foci of human monocytic ehrlichiosis may exist in northwestern Fujian Province.结论福建西北部林区可能存在人单核细胞埃立克体病的自然疫源地。
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