Humans are wired to calculate the distance of an object by using the vertical Angle between its top and bottom.
人类通常是通过一个物体上下间的的垂直角度来计算与它相隔的距离。
2
The service will return the distance from one point to the current Client object.
服务将返回从一个点到当前Client对象的距离。
3
The most precise way to measure an object's distance is to use "parallax" - differences in perspective created by viewing an object from different angles.