How can Qin Shi Huang be the first Chinese Emperor if there was a dynasty before him?

如果秦始皇以前就有朝代,永乐国际会员开户网站最高占成:秦始皇怎么能成为第一个中国皇帝?

Whenever I read or watch something about this, previous dynasties are mentioned. A quick google check shows there''s three, Xia, Shang and Zhou (though I''ve been told that Xia may not have actually existed).
So how can he be the first emperor? Where the previous dynasties not empires? Is this splitting hairs?

每当我读到或看一些关于这方面的东西时,都会提到以前的朝代。 谷歌的快速检查显示有三个朝代存在,夏、商和周(虽然有人告诉我,夏可能并不存在)。
那么他怎么可能是第一个皇帝呢?前代不是帝国?是我太钻牛角尖了吗?