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Petroleum
石油
Petroleum has been important since ancient times.
石油自古以來就非常重要，
The Greek historian told of its use in the form of pitch for building and road making.
希臘歷史學家表示它的用途是用作修建房屋和道路的瀝青。
Petroleum is a fossil fuel.
石油是一種化石燃料。
The liquid comes from the remains of plants and animals that died millions of years ago.These remains were buried deep below levels of rock over time and under great pressure.
它是深埋在巖石層下達數百萬年的動植物遺體在重壓下經年累月形成的。
This geological process created complex molecules of hydrogen and carbon.
這種漫長的地質作用產生了復雜的碳氫化合物分子。
Oil can also contain other elements.
石油也可以含有其他元素。
Crude oil, or unprocessed petroleum,is called sour when it contains a lot of sulphur, an impurity.
高硫石油是石油剛開采出來為經提煉加工的物質，含豐富的硫。
Sour crude requires more refining than sweet crude,which is low in sulphur and, as a result, often more valuable.
高硫化油比低硫原油需要更多次提煉，因而低硫原油價值更高。
The modern history of oil started in the middle of the 1800s.
石油的現代史開始于19世紀中期，
At that time, a method was found to make kerosene fuel from petroleum.
那時人們已經知道如何從石油中提煉出煤油了。
This kind of fuel became popular for heating and lighting.
這種燃料在取暖和照明上用途廣泛。
