This is the 3311th most frequent Chinese word.
国安
"国安" translates to "national security" in English.
In this context, '国安' refers to a specific football team named 'Guoan'.
国安队是一支非常杰出的足球队。
The Guoan team is an excellent football team.
Here, '国安' stands for 'national security', indicating the country's safety and stability.
维护国安是每一个公民的责任。
Safeguarding national security is the responsibility of every citizen.
In this sentence, '国安' again relates to the concept of national security, emphasizing its policy aspect.