In Taipei, for instance, factories have been systematically located outside the city limits, but millions of miniature factories on wheels--cars and motorcycles--are the main producers of air pollution.
就如台北市，由於工廠已有計畫遷出市區，上百萬的小型流動工廠﹘﹘汽機車，遂成了台北市空氣汙染的主要製造者。