【简答题】London used to be “foggy” for the same reason that cities like Beijing or Chongqing are “foggy” today. The “fog” was in fact smog, a mixture of smoke and fog. In other words, it was made by air pollut...
【简答题】London used to be “foggy” for the same reason that cities like Beijing or Chongqing are “foggy” today.The “fog” was in fact smog, a mixture of smoke and fog.In other words, it was made by air pollutio...