iso-

例句：

1. 1. The iso-speed is the speed of light in a vacuum.
   光速在真空中的速度被称为iso-速度。
2. 2. The iso-distance is the distance between two points on a sphere.
   球面上两点之间的距离被称为iso-距离。
3. 3. The iso-temperature is the temperature at which the density of a substance is constant.
   物质密度恒定时的温度被称为iso-温度。