1 、 mist即cloudy air near the ground, made up of very small floating drops of water，指「薄雾」，例如﹕The hills were hidden in mist.那些山丘隐藏在薄雾中。2、fog即a very thick mist，指「雾」，或「雾气」，例如﹕London was famous for dense fogs.伦敦曾以大雾闻名。注1﹕近几十年来，伦敦已少见大雾。注2﹕可用bad、dense、heavy、thick等字形容fog，表示「大雾」或「浓雾」，但不可说big fog。还有两个词也可以表示雾3、 haze即a very thin mist, especially caused by hot weather，指「烟雾」，或「薄雾」，或「霾」，多由天气炎热所引起，例如﹕The mountain was barely visible through the haze.透过薄雾，该山仅隐约可见。4、 smog即a haze caused by the effect of sunlight on foggy air that has been polluted by vehicle exhaust gases and industrial smoke，指「烟雾」，常由汽车尾气和工厂烟尘所造成，属空气污染。在罗省(Los Angeles)、墨西哥城(Mexican City)和香港等大城市，常可见到smog，对居民健康造成威胁。
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