And by presenting a really strong economic case, they convinced the L.A. government that replacing that asphalt with trees and other greenery, that the schools themselves would save the system more on energy than they spend on horticultural infrastructure.
通过展示一个非常经济实惠的案例， 他们说服洛杉矶政府改变计划， 将沥青 换成绿树和其它绿化带， 这样学校在绿化建设方面 节省更多人力物力。