friend or foe

基本解释

Hollywood and science fiction novelists have been wrestling with this "friend or foe" question for decades.
几十年来，好莱坞和科幻小说家们一直在为这个“朋友或是敌人”的命题争斗不休。
For example, in one chapter, "Online Tutorials: Friend or Foe," Greg covers a number of online learning resources, noting their strengths and mapping out drawbacks and skewering weak areas.
例如，在其中一章中，“在线教师：朋友还是敌人？” ，Greg介绍了很多在线学习资源，提到了这些资源的作用，列出缺点和不够好的地方。
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These amplifiers are key components in a complex Identification Friend or Foe (IFF) system used to interrogate aircraft to determine their friend or foe status.
这些放大器是一种复杂敌我识别系统（IFF）的重要组成部分，专门用来问讯飞机，以确定他们是敌是友。
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Americans are trying to decide whether the U.A.E. is friend or foe or something in between.
NPR: United States, Dubai: Understanding the Links
Quantum dots tagging will ease "friend or foe" identification in extreme conditions on the front line.
FORBES: Nanotech Takes On Homeland Terror
Is China a friend or foe of the U.S.? Post your thoughts below.
FORBES: China's Mental Default Position