proportionality law

例句：

1. 1.The law of proportionality is that if two events are equally likely, the probability of one event occurring is equal to the probability of the other.
   比例法则是，如果两个事件同等可能发生，一个事件发生的概率等于另一个事件的概率。
2. 2. In economics, the law of diminishing returns suggests that as output increases, each additional unit of input produces asmaller percentage of output increase.
   在经济学中，递减回报法则表明，随着产出的增加，每一单位投入带来的产出增加百分比会减小。
3. 3. The law of conservation of mass states that in an isolated system, the total mass remains constant, regardless of the changes in the composition of the substances.
   质量守恒定律指出，在一个孤立系统中，总质量保持不变，无论物质成分如何变化。