由于它们数量众多，无法一一提及，液化石油气体，如丙烷和丁烷没有包括在这里。
Liquefied petroleum gases, such as propane and butane, have not been included as they are too numerous to mention.
曼迪·乔伊：泄露的还有丙烷和丁烷等气体，这些气体是在石油钻取过程中产生的。
Mandy Joye: and there's also propane and butane, and gases that derive from the same processes that make the oil.
丙烷也可用作液化石油气。
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