Petroleum石油
Petroleum has been important since ancient times.石油自古以来就非常重要，
The Greek historian told of its use in the form of pitch for building and road making.希腊历史学家表示它的用途是用作修建房屋和道路的沥青。
Petroleum is a fossil fuel.石油是一种化石燃料。
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.它是深埋在岩石层下达数百
