另一个方法是让室温的乙二醇通过外边结冰的管子。
The other method runs room-temperature glycol through those same iced-over tubes.
消费者购买的所谓便利不过是聚对苯二甲酸乙二醇酯（PET）——工业史上极为重要的发明之一。
When people bought this convenience, what they were really buying was Polyethylene Terephthalate, or PET, the single most important innovation in the industry's history.
PET由两种原料制成，一种是有机酸，另一种是相对便宜的乙二醇。
PET is made from two feedstocks, one of them an organic acid, the other ethylene glycol, which is relatively inexpensive.
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