煤-Coal
coalissocommonlyusedinlifethatweseldomnoticeit.weburncoaleverydaytoheatfoodandwater.thefirstlocomativewasdrivenbyburningcoal.inwinterwefeelaspecialneedforcoal.thecoalgivesusfire,light,heatandwarmth.in...
coalissocommonlyusedinlifethatweseldomnoticeit.weburncoaleverydaytoheatfoodandwater.thefirstlocomativewasdrivenbyburningcoal.inwinterwefeelaspecialneedforcoal.thecoalgivesusfire,light,heatandwarmth.in...