Security. It's a noun, the state of being,   protected or safe from harm. Things done to make people or places safe. Going through  airport security usually takes about 45 minutes.

安全。 它是一个名词， 表示受保护或免受伤害的状态。为使人或地方安全而做的事情。 通过机场安检通常需要大约 45 分钟。