英语四级考试必备词汇及短语、简写(9)

UN: United Nations
FAQ: Frequently Asked Questions
ETA: Estimated Time of Arrival
ATM: Automated Teller Machine
ICU: Intensive Care Unit
MBA: Master of Business Administration
CEO: Chief Executive Officer
DIY: Do It Yourself
VIP: Very Important Person
UFO: Unidentified Flying Object
PM: Post Meridiem (afternoon)
AM: Ante Meridiem (morning)
SUV: Sports Utility Vehicle
GDP: Gross Domestic Product
NGO: Non-Governmental Organization
NASA: National Aeronautics and Space Administration
NATO: North Atlantic Treaty Organization
SARS: Severe Acute Respiratory Syndrome
AIDS: Acquired Immune Deficiency Syndrome
WHO: World Health Organization
FBI: Federal Bureau of Investigation
以上是一些英语四级考试常用的缩略语和简写，考生在备考过程中应该注重对它们的掌握和理解。在应用这些缩略语和简写时，需要注意语境和正确性，避免产生歧义或者造成误解。