epidemic
relating to or affecting a large number of people within a community, population, or region
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传染性
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heart attack
a medical emergency that happens when blood flow to the heart is suddenly blocked, which is fatal in some cases
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心脏病发作
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infected
(of a person, organism, etc.) affected by disease-causing organisms, such as bacteria, a virus, etc.
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已感染
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symptom
a change in the normal condition of the body of a person, which is the sign of a disease
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症状
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[名词]
infectious
(of a disease or condition) capable of transmitting from one person, organism, or object to another through direct or indirect contact
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传染性的
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