A data carrier mounted and demounted as a unit, for example, a reel of magnetic tape, a disk pack.
可作为一个部件安装和卸下的存储数据的介质，例如，一个磁带卷，一个磁盘组。
Reel-stand: The unit housing a reel of paper at the feed end of a web press.
卷筒纸架：在卷筒纸机的给纸部份，放置纸卷的单位。
The reel functions are hydraulically powered and controlled from the unit control cabin.
从控制室可液压带动和控制卷筒。
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