常用短语用法复习知识点vital to/void of/wait for
vital to对……关系重大
例句This point is vital to my argument.
这一点对我的论据极为重要。
Quality is vital to an enterprise.
质量是企业的生命。
Air is vital to all creatures.
空气对所有的生物都极为重要。
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void of没有，缺乏
例句Her face was void of all interest.
她面部表情显得对什么都不感兴趣。
That subject is void of interest.
那个题目没有趣味。
Her face was void of expression.
她的脸毫无表情。

wait for 等待
例句What are you waiting for?
你还在等什么？
Please wait for me at the bus terminal.
请在公共汽车终点站等我。
Time and tide wait for no man.
岁月不等人。


A. The timing of influenza vaccine production and distribution is unpredictable. 
B. However, it’s a different story when it comes to influenza, commonly known as “the flu”. 
C. People should get a flu vaccine before flu viruses spread in the community.
D. The virus essentially “changes its coat” — H1N1, H2N3, and so on, as he told the website Healthline. 
E. He said it takes about two weeks after vaccination for antibodies to develop in the body and provide protection against the flu infection.
F. So the vaccines are likely to be updated from one season to the next to protect against the viruses. 
Guard against Flu
Vaccination (接种疫苗) is among the most effective ways to help us prevent diseases. For viruses that don’t change too much — the measles virus (麻疹病毒), for example — getting vaccinated is a once-and-for-all method to prevent you from becoming infected with the virus. If you had two measles vaccines when you were a child, you will be protected for life.
____67____ It generally peaks between December and February. Flu vaccines cannot protect us in the long run. There is no permanent immunity, according to Theodore Strange, associate medical director at Staten Island University Hospital in New York. ____68____
Apart from a person’s immune protection from flu vaccination declining over time, flu viruses are also constantly changing. ____69____ To develop effective flu vaccines, over 100 national influenza (流感) centers around the world conduct year-round observation for influenza. Researchers will test thousands of influenza virus samples from patients, according to US Centers for Disease Control and Prevention (CDC). The World Health Organization also suggests three or four influenza viruses that are most likely to spread among people during the upcoming flu season.
But even when a vaccine is developed, getting it can prove to be difficult, as demand tends to exceed supply. ____70____ The availability of the flu vaccine supply does not always coincide with peak demand.
So scientists prioritize access to the vaccination. The CDC recommends key populations, such as medical staff, teachers, students, children and those aged 60 and above, receive flu vaccines.
答案
67-70 BDFA

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