So you cannot tell from the average everything that happened because another way to get the same 0 is to just not move at all.

所以说平均速度并不能提供所有的信息,因为完全静止所得出的结果也是0

耶鲁公开课 - 基础物理课程节选

F.D. stands for full disclosure -this is a SEC regulation.

.D.是指公司财务信息的完全披露,这是证交会的一项规定

耶鲁公开课 - 金融市场课程节选