Everybody moves to the right, these guys move to the right, those guys move to the right and they're smacking each other at something like that angle.

每个人都转向右边,这些人转向右边,那些人也转向右边并相互击打,大概就是以这样的角度

耶鲁公开课 - 古希腊历史简介课程节选

One way is to just use your common sense and realize that if you push it this way, these two guys are going to move together.

第一种方法就是你可以通过常识感觉到,如果你这样推它,这两个物体会一起运动

耶鲁公开课 - 基础物理课程节选