countermeasure /ˈkaʊntəˌmɛʒə/

• 1. 

  N-COUNT A countermeasure is an action that you take in order to weaken the effect of another action or a situation, or to make it harmless. 对策; 对抗措施

  例：

  Because the threat never developed, we didn't need to take any real countermeasures.

  由于这个威胁从未显现，我们也就没有必须采取任何真正的对策。