A badly dented can or a mangled package is useless in protecting food from microorganisms, insects, spoilage, or even vandals.
一个严重凹陷或保护食品的微生物，昆虫，变质损坏包装是无用的，甚至是破坏者。
Sometimes the swollen ends can be moved by thumb pressure (soft swells); in other cases the gas pressure is so great that the ends cannot be dented by hand (hard swells).
有时膨胀的两端在手指压力的作用下发生移动，在其它情况下，气体的压力足够大的使得膨胀的两端不能用手指按回。
Has discussed a device that can be used to grinding dented surface of spare parts by back and forth movement. It has been introduced that the composition, the moving scheme, the structure and usage.
介绍一种往复式金属零件凹表面打磨装置的组成部分、运动方案、基本结构和使用情况。
Has discussed a device that can be used to grinding dented surface of spare parts by back and forth movement. It has been introduced that the composition, the moving scheme, the structure and usage.
介绍一种往复式金属零件凹表面打磨装置的组成部分、运动方案、基本结构和使用情况。
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