law of substitution

例句：

1. 1. The new law allows for the substitution of a different type of fuel in place of gasoline.
   新法律允许用另一种类型的燃料替换汽油。
2. 2.The company's decision to substitute foreign workers for local ones was met with criticism.
   公司决定用外籍工人替代本地工人，这一决定受到了批评。
3. 3. The substitution of one chemical for another is often necessary in industrial processes.
   在工业过程中，一种化学物质被另一种所替代通常是必要的。