n. involution
同时确定了中间包卷渣的临界高度。
The critical highness of slag entrapment was gained in tundish.
护封：包卷书本的保护封套。它通常用纸造成。
Bool jacket: Protective wrap-round to a book, usually made of paper. Also called jacket, Dust jacket.
随后，被完全包卷的滤嘴元件利用接装纸与烟杆相连。
Subsequently, the completely wrapped filter components are joined to tobacco rods with tipping paper.
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