The film stretching machine consists of a film-stretching roller installed on the film-stretching frame and an air cylinder in connection therewith.
所述的拉膜器系由设置在拉膜架上的拉膜辊筒和与之相连的气缸构成；
These roller bags that make it easier to lug your junk around airports are in keeping with etymology stretching back more than 600 years.
这些滚轮包可以让你更方便地在机场拖着你的杂物，它的词源可以追溯到600多年前。
So these roller bags that make it easier to lug your junk around airports are in keeping with etymology stretching back more than 600 years.
有了这种装有滚轮的箱包，你在机场就能轻松地拖着大堆杂物四处行走，这种形象也和它600多年前的词源相一致。
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