Some progress is being made-aluminum cans and plastic soda bottles have become thinner over the years, but more reductions will require a whole new kind of manufacturing process.
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释义
这方面已经有了一些进展--几年来,铝制罐和塑料汽水瓶变得越来越薄了,但要进一步减轻重量,就必须使用全新的制造过程。
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