The formal definition is that the gravitational potential energy at a point P is the work that I, Walter Lewin, have to do to bring that mass from infinity to that point P.
形式定义就是,它在点P的重力势能,等于我，将物体从无穷远处,移动至点P所做的功。
The far point of a normal eye is at infinity.
正常眼的远点在无穷远处。
Edge Conditions can be used as criteria which must be obeyed by electric fields as they approach infinity at the local irregular point of a conductor.
可以采用边缘条件作为导体的局部非正则点处电场趋于无限大时应遵循的准则。
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