概率论的基本原理之一叫做乘法法则。
One of the first principles of probability theory is called the multiplication rule.
在1738年，丹尼尔试图用微积分来解决一个概率论和赌博理论里的问题，无意间却发现了货币的边际效用递减法则的概念。
In 1738, Daniel, trying to solve a problem in probability theory and the theory of gambling by use of the calculus, stumbled on the concept of the law of diminishing marginal utility of money.
鸟类听不懂斯诺鲍的长篇大论，但他们接受了他的解释，所有笨一点的动物都开始着手熟记这条新法则。
The birds did not understand Snowball's long words, but they accepted his explanation, and all the humbler animals set to work to learn the new maxim by heart.
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