three-hour range index

例句：

1. 1.The three-hour range index is a measure of how far the sun can travel in one day.
   三小时范围指数是衡量太阳在一天内能移动的距离的指标。
2. 2. The three-hour range index is used to calculate the time it takes for an object to travel from one point to another within a three-hour period.
   三小时范围指数用于计算一个物体在三小时内从一个点移动到另一个点所需的时间。
3. 3. The three-hour range index is also used to estimate the amount of sunlight that reaches the ground during a three-hour period.
   三小时范围指数还被用来估计三小时内到达地面的阳光量。