adj.无理数的；不尽根数的；无声的
n.无理数；不尽根数；无声音
The square root of 5 (5) is a surd. 5的平方根（5）是不尽根.
But I don't think so; in view of the fact I'm not quite surd. 但不这样认为,鉴于事实说明,我不相信是这样。
Example 1: Solve the following quadratic equations, leave the answers in surd form. 例1：解下列的二次方程，如果需要，以根式表示。
After the person has gone, one Surd turns to another and laughs."What a nut, we're looking for the height and he gives us the length. 那人走了以后，这个萨达人对另一个说：“真是个怪人，我们要的是那个高度，而他却给了我们一个长度。”
also includes rational number, surd; 也包含有理数、无理数;
