Republicans also asserted that the nuclear revelation supports their position that President Obama acted unwisely in altering plans for a European missile shield to defend against future missile launches by Iran.

VOA: standard.2009.09.25

Once you know those, you can find the position of the object at all future times.

只要知道了这些,你就能知道物体在任意时刻的位置

耶鲁公开课 - 基础物理课程节选