This is a difficult thing to prove, not least because each of those categories is controversial and there is a world of difference between, say, Northern Ireland and Sri Lanka.

• 这件事很难证明，主要原因是上述每一个范畴都是有争议的，而且有时候两个地方（例如北爱尔兰和斯里兰卡）的情况天差地别。