名词
中文翻译：Unknown
同义词：
['epidemic', 'contagious disease', 'infectious disease']
例句：
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1. The new virus has caused a global epidemic.
新病毒已经引发了全球大流行。
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2. Epidemics are often caused by bacteria or viruses.
流行病通常是由细菌或病毒引起的。
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3. The government is working to contain the spread of the epidemic.
政府正在努力控制疫情的蔓延。