名词
中文翻译：周期性攻击
同义词：
['periodic illness', 'periodic disease', 'periodic infection']
例句：
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1. Thepatient had a periodic attack of nausea and vomiting.
患者有周期性的恶心和呕吐发作。
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2. The researcher discovered that the virus has a periodic attack on humans.
研究者发现这种病毒对人类有周期性的攻击。
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3. The outbreak was caused by a periodic attack of the flu.
疫情是由流感的周期性攻击引起的。