二重卷边是金属罐制造工艺流程中最重要的环节，卷封滚轮是封罐机上最核心、最重要的零件之一。

Double-seam is the most important link in canning manufacture technical process, and the seam roller is one of the most core and important components on the can seamer.

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为了制造一个铝罐，就得消耗能源。

To make an aluminum can, that takes energy.

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于女士和她的男朋友乔·哈维都遵循了“零浪费6 R”的规则，只制造了两罐垃圾。

Yu followed the rule of "zero waste 6R", and she and her boyfriend Joe Harvey both produced only two cans of rubbish.

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