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（单词翻译）
Milan bans cars to reduce pollution
Vocabulary
murky haze
air difficult to see through due to smoke
pollution hotspots
areas where the air has its highest concentration of harmful substances
acute
severe, serious
seasonal average
usual temperatures for that time of the year
exacerbated
worsened
perennial
continuous
smog
heavily polluted air that contains a mixture of smoke, gases and chemicals
a trick of nature
an event that has not being prompted by man, it happens naturally
a shallow bowl
a depressed landscape with surroundings slightly higher than the centre
triggered
brought about
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