送入成卷机的棉条被拉伸成薄层并卷绕在筒管上。
Slivers are fed through the lapper that smooths them to a thin layer of fibers which is wound onto a roll.
头道并条机将梳棉棉条的纤维梳理平行顺直并拉伸成薄层，再重新形成棉条。
The breaker-drawing unit smooths out the card slivers, pulls out the fibers into a thin layer, and re-forms a new sliver.
恒星的结构经常被想象成一系列套在一起的薄层，就像洋葱一样。
The structure of a star can often be thought of as a series of thin nested shells, somewhat like an onion.
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