What projection does is takes a desire from me and then puts it on somebody else heading outwards.

投射是指个体否认自己的欲望,并认为他人拥有此欲望。

耶鲁公开课 - 心理学导论课程节选

This equation is telling you if you compress it, namely if x is negative, F will be then positive, because it's pushing you outwards.

这个方程告诉我们,如果压缩弹簧,即令 x 为负,F 就为正,因为推力的方向向外

耶鲁公开课 - 基础物理课程节选