refining process短语⁸⁴³²⁰⁺⁸ 基本例句 提炼过程 Almost all of the global supply of helium is located within250 miles of Amarillo, Texas; it's distilled from accumulated natural gas and extracted during the refining process. 几乎全部所有的氦都由德克萨斯州阿马里洛市方圆250英里的地区供应；它是通过从积聚的天然气中蒸馏并在精炼中萃取而来的。 yeeyan