模仿句子：Well it's now a week since American authority set off a firestorm around the world's biggest car maker Volkswagen when the Environmental Protection Agency declared VW had been cheating the results of emissions tests. 

一周前，美国环保署宣布大众汽车公司一直都在尾气排放检测的结果上做假，由此将世界上最大的汽车制造商推上了风口浪尖。