immovable point

• 固定点

immovable point的用法和样例：

例句

1. The era name is the name a calendar uses to refer to a period of time reckoned from a fixed point or event.
   纪元名称是日历用来指代从某个固定点或事件计算的一段时间的名称。
2. A plane curve formed by the locusof points equidistant from a fixed line and a fixed point not on the line.
   抛物线到一固定直线和不在直线上某一固定点等距的点的轨迹所形成的平面曲线。