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smogs的音標：...

New York City has had several London - type smogs since 1950.自1950年以來,紐約市發(fā)生過幾次倫敦 式 的煙霧.Killer smogs don't happen very often, fortunately.幸虧致人死命的煙霧不常出現(xiàn)....

n.煙霧( smog的名詞復數(shù) )...