同义词是pandemy，pandemia，中文意思是大流行病
大流行病通常主要影响某些特定年龄组。Pandemics usually have a concentrated adverse impact in specific age groups.
历史上第一次，国际社会可实时目睹大流行病的发生，勾勒其演进轨迹。
For the first time in history， the international community could watch a pandemic unfold， and chart its evolution， in real time.
