This practice of underground storage is being widely used by the gas industry in many countries. 这种地下储存的方法，目前正广泛地为许多国家的煤气工业所采用。
Pollutants from industrial sources may pour out from the outfall pipes of factories or may leak from pipelines and underground storage tanks. 工业污染物可从工厂中的排泄管流出，或者可从管道和地下储存罐中外泄。
