The students use the mixture to fertilize the soil instead of buying chemical fertilizers that could harm the environment.

VOA: special.2009.04.14

Inside of solve, solve creates an environment where inside of that, it has bindings for the parameters it's going to use. All right?

在solve内部，solve创建了一个环境,在这个环境中它给她要使用的形参赋了值,明白吗？就像很多--等等？

麻省理工公开课 - 计算机科学及编程导论课程节选

But he says many parts of the world use too much nitrogen fertilizer, and that harms the environment.

VOA: special.2011.04.05

They teach the need for farming to improve the environment and make good use of natural resources.

VOA: special.2009.04.14