1.national security 国家安全
例句:If there is one issue that should unite us – as Republicans and Democrats – it should be our national security.
如果说还有什么问题能让共和党人和民主党人团结起来,那便是我们的国家安全 。
2.let go 放开,释放
例句:For your own sake, let go of the past.
为了你自己,让过去的事情过去吧 。