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　　注：文本及音频选自《新托福iBT词汇分类突破》Unit129-130；单词释义主要来自《美国传统词典》。

　　Clouds, and almost all precipitation, are produced by the cooling of air as it rises.开云官网 When the air temperature is reduced, excess water vapourin the air condensesinto liquid droplets, or ice crystals.开云平台 A fogis formed when this happens close to the surface of the earth, but when it occurs higher up, clouds will appear in the sky.

　　?cloud: A visible body of very fine water droplets or ice particles suspended in the atmosphere at altitudes ranging up to several miles above sea level.

　　云：十分细小的水滴或冰粒组成的可见的一团，悬垂于海面上高度达几英里的大气中

　　?precipitationpri-?si-p?-?tā-sh?n: Any form of water, such as rain, snow, sleet, or hail, that falls to the earth's surface.

　　降水：暴雨、雪、冻雪或冰雹降落到地表的任何形式的水

　　?condense: to change from a gas into a liquid; to make a gas change into a liquid

　　(由气体)冷凝；(使气体)凝结

　　droplet: A tiny drop. 小滴

　　?fog: Condensed water vapor in cloudlike masses lying close to the ground and limiting visibility.

　　雾气：离地很近并限制能见度的以云状气团形式出现的浓缩水蒸汽

　　Fog is thickenedand acidifiedwhen the air is filled with sulfur-laden soot particlesproduced by burning coal. Dense acid fogswere the cause of thousands of deaths in UK up to 1956, when legislationwas introduced prohibiting coal buring in the cities.

　　?thicken: To make or become thick or thicker:

　　使变得或变得浓或更浓些

　　?acidify: To make or become acid.

　　使成为酸，变成酸

　　?laden-: -laden used to form adjectives showing that sth is full of, or loaded with, the thing mentioned

　　(用于构成形容词)充满…的,装载…的

　　?soot: The fine black particles, chiefly composed of carbon, produced by incomplete combustion of coal, oil, wood, or other fuels.

　　煤烟：由于煤炭、油、木材或其他开云中国燃料的不完全燃烧而产生的精细黑色颗粒，主要由碳组成

　　?legislation?le-j?s-?lā-sh?n: A proposed or enacted law or group of laws.

　　法律，法规：被提议或制定的法律或一组法规