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。
", in fact, at this point, the five name and brand is a very low probability, it is even 0, and relative say others is a probability of fishing alone "infinity", it is not for luck."
实际上此时，五个叫的和牌现张概率极低，甚至为0，而相对说别人单钓的现张概率就“无穷大”，这不能以运气而论。
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