Asmachinesgo,thecarisnotterriblynoisy,norterriblypollut...
问题详情：Asmachinesgo,thecarisnotterriblynoisy,norterriblypolluting,norterriblydangerous;andonallthosedimensionsithasbecomebetterasthecenturyhasgrownolder.ThemainProblemisitsprevalence,andthesocialcost...