Here's an example: if I were to tell you, let's play a little coin toss game, and I'm going to flip a coin, and if it comes up heads, I'm going to pay you 10 dollars, but you have to pay four dollars for the privilege of playing with me, most of you would say, sure, I'll take that bet. Because you know that the odds of you winning are one half, the gain if you do is 10 dollars,
举个例子：假如我告诉你， 我们来猜硬币，我扔一枚硬币， 人头朝上，我输你10美元， 但你必须先付给我4美元才能玩。 很多人会说，好啊，我跟你玩。 因为你知道 你有50%的赢面， 而赢了能得到10美元，