每次看HelloTalk的动态时，我都会看到头像上的国旗，但总是认不出它们代表哪个国家。所以我需要一个国家、一面国旗地逐一学习。加油！ Every time I look at the updates of Hello Talk, I see the flags on the Profile pictures,but always fail to recognize which country they represent. So I need to learn them one country and one flag at a time. Come on!