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美国犹他州盐湖城一家超级市场研究机构,最近研制成一种自冷式饮料罐头。这可能是自1962年开始大量使用顶部开启式罐头以来,在罐头制造技术上的首次突破。自冷式罐头内部装有一个加压后的二氧化碳气体的小盒子。当拉动顶盖上薄片以开
A supermarket research firm in Salt Lake City, Utah, recently developed a self-cooled beverage can. This is probably the first breakthrough in canning technology since the extensive use of open top cans since 1962. Self-cooled cans contain a small box of pressurized carbon dioxide gas inside. When pulling the top cover sheet to open