commercial rock gas

• 天然气

commercial rock gas的用法和样例：

例句

1. Natural gas is often present in the reservoir rock.
   储油岩中常有天然气。
2. Siberia is a major gas produced area.
   西伯利亚地区是俄罗斯主要的天然气产区。
3. Petroleum gas can be used as fuel as well as a chemical material.
   石油气既可以用作燃料又可以用作化工原料。
4. The phenomenon of vapor explosions threatens the safe storage and transportation of liquefied petroleum gas.
   液化石油气蒸汽爆炸是对其安全储运构成很大威胁的一种观象。