It is useful for status flags and for other things that don't change during the life of a process, like pi, for example, or all the countries in Africa.

它用于状态标志和进程生命周期中不发生更改的其他东西，比如 pi 或非洲的所有国家。

youdao

Water flies as a young white tiger shakes itself dry in a pool at California 's Marine world Africa USA. now called six flags discovery kingdom.

加利福尼亚海洋世界(现在叫六旗探索王国)，水池中的年轻白虎试图把自己甩干而弄得水花四溅。

youdao

A group of about 100 African Catholics were in Saint Peter's Square waving African flags and banners that read "Africa Loves the Pope".

VOA: standard.2009.03.29

"It wasn't very long ago that the average American child saw Africa as colorful flags and exotic names on a map, " Clinton said.

CNN: Clinton says U.S. will be 'friend for life' of Africa