经观察发现,金属边框微微翘起,影响其规则的扁平形状,这可能是塑料盖将瓶口封得太紧的缘故.另外,我们在边框背面还发现有金属波纹,这说明封装机工艺设备是不能够生产在其它制造产品上看到的表面平整光滑的产品.
英语翻译A matter of observation was the metal rimwas found to ha
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