1
have influenza
influenza 通常作不可数名词，表示患某种疾病时不加 a/an。
She had influenza last winter.
她去年冬天得了流感。
流感；流行性感冒
先理解核心含义，再看它在真实句子里的用法。
流感；流行性感冒
an acute, highly contagious viral disease marked by fever
She had influenza last winter.
她去年冬天得了流感。
An acute contagious disease of the upper airways and lungs, caused by a virus, which rapidly spreads around the world in seasonal epidemics.
一种急性发热、高度传染性的病毒性疾病
an acute febrile highly contagious viral disease
Many people get influenza in the winter, so doctors recommend a yearly vaccine.
许多人在冬天得流感，因此医生建议每年接种疫苗。
She stayed home from work for a week because of a bad case of influenza.
她因为得了重流感而请假在家待了一周。
The clinic offered free influenza shots to all employees.
诊所向所有员工免费提供了流感疫苗。
influenza 通常作不可数名词，表示患某种疾病时不加 a/an。
She had influenza last winter.
她去年冬天得了流感。
suffer from 后接疾病名称，influenza 前不加冠词。
He was suffering from influenza and stayed in bed.
他正患流感，卧床休息。
a case of 表示“一例（疾病）”，influenza 保持单数形式。
The doctor reported a severe case of influenza.
医生报告了一例重症流感。
vaccinate against 是常用搭配，against 后接疾病名称。
Thousands were vaccinated against influenza.
数千人接种了流感疫苗。
Not this
I had an influenza last week.
Use this
I had influenza last week.
influenza 指疾病时通常为不可数名词，前面不加不定冠词 an；要表示“得了流感”直接用 have influenza。
Not this
We should prevent from influenza.
Use this
We should prevent influenza.
prevent 是及物动词，直接接宾语，没有 prevent from + 名词的用法；prevent from 的搭配是 prevent somebody from doing something。
Not this
The influence has caused many deaths.
Use this
The influenza has caused many deaths.
influence 意为“影响”，influenza 意为“流行性感冒”，二者拼写相似但意思不同；此处说的是流感，应用 influenza。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
流感病毒
The influenza virus spreads easily in crowded places.
流感病毒在拥挤的地方容易传播。
季节性流感
The vaccine protects against seasonal influenza.
这种疫苗可预防季节性流感。
禽流感
Poultry farmers were worried about avian influenza.
家禽养殖户曾担心禽流感。
流感疫苗
Health officials recommend the influenza vaccine for older adults.
卫生官员建议老年人接种流感疫苗。
流感大流行
The 1918 influenza pandemic killed millions of people.
1918年的流感大流行导致数百万人死亡。
流感样疾病
Doctors reported a rise in influenza-like illness.
医生报告流感样疾病的病例有所增加。
Use influenza naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
influenza 里藏着 flu（流感），in 像病毒“进入”身体，enza 尾音像难受的“嗯啊”声，记住这词就是流感。
语域：formal 常见场景：medical reports、public health announcements、academic writing influenza 属于正式、偏医学术语，通常用于医学文献、公共卫生公告或正式写作；日常口语中更常用 flu。
复数形式 influenzas 或 influenze 表示不同种类的流感。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.