degree of a permutation group

例句：

1. 1.The temperature has dropped to a low degree of -20°C.
   温度已经降到了零下20度。
2. 2.The physicist calculated the angle between the two lines with an accuracy of one degree.
   物理学家计算了两条线之间的夹角，精确到了一度。
3. 3. The new policy will have a significant effect on the economic degree of freedom.
   新的政策将对经济的自由度产生重大影响。