In the first example above, we were studying the extension Q(√3)/Q, where Q is the field of rational numbers, and Q(√3) is the field obtained from Q by adjoining √3.
在上面的第一个例子中，我们研究的是域扩张Q(√3)/Q，其中Q是有理数域，而Q(√3)是在Q中加入√3之后所得到的域。