急问：nation flag是国旗,那么state flag是什么?区别在哪里?

题目

急问：nation flag是国旗,那么state flag是什么?区别在哪里?
On 1 January 2006,the new State Flag Act enters into force in Estonia.The most important change introduced by the new law is that all individuals have the right to use the state flag as a national flag whenever they feel it fit to do so,but the use of the flag must be appropriate and respectful of time-honoured traditions.State flags are permanently flown over state institutions,local and city governments,and also at border crossing points.
问题在这段话里,爱沙尼亚并不是联邦制国家啊.

答案

大多数国家只有一面国旗,英文称为「National Flag」；但有20个国家却还有另一种国旗称为「State Flag」,它用于官方非常正式的场合,通常二者的差别只是增加一枚国徽.所以有些国家的国旗会有二种版本出现.因为波利维亚...