It is the duty of every citizen to honor the national flag.Why?Because the national flag is the symbol of a (the) country.To respect it means to respect the country.In other words, if a man loves his country, he must love the national flag.

　　尊敬国旗是每个公民的责任(义务)。为什么?因为国旗是国家的象征。尊敬它意思就是尊敬国家。换句话说，如果一个人爱国，他必须爱国旗。