2017年考研英语二真题词汇解析如下：
1. vulnerable：易受伤害的，脆弱的。例句：The company is vulnerable to market fluctuations.
2. intensify：加强，加剧。例句：The competition between the two companies has intensified.
3. recession：衰退，经济衰退期。例句：The country is facing a severe recession.
4. prosperity：繁荣，兴旺。例句：The city is enjoying an era of prosperity.
5. pandemic：大流行病，疫情。例句：The pandemic has caused a lot of suffering.
6. epidemic：流行病，传染病。例句：The flu epidemic is spreading rapidly.
7. prevalence：普遍，流行。例句：There is a prevalence of obesity in modern society.
8. infection：感染，传染。例句：The infection was quickly spread among the patients.
9. virus：病毒。例句：The virus is highly contagious.
10. immunity：免疫力，免疫性。例句：The vaccine can provide immunity against the disease.
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