because,first of all,

因为首先
both of them are members of the Greek League too,

双方都是希腊同盟的成员
and as the United Nations Organization Charter

就像联合国宪章
permits regional associations,

也认可地区性组织的存在
so NATO and the Warsaw Pact were regional associations,

北约和华约都是地区性组织
so too without their being any formality about it,

因此同样的尽管没有什么正式手续
it clearly didn't mean to abolish the Peloponnesian League.

但显然没有要废弃伯罗奔尼撒同盟的意思
Therefore,there was no reason

因此也没有理由
why there shouldn't be a different regional alliance

说为什么不能有一个提洛同盟
like that of the Delian League.

那样的地区性组织存在
that,I think, is the structure of the international system in Greece

我认为这就是在希波战争后
as we move past the Persian wars.

希腊地区的国际关系格局