Analysis is done to the main working principle of cots plus aprons in drafting process as well as the main specifications of cots plus aprons on spinning process.

分析了胶辊、胶圈在纺纱牵伸过程中的主要作用原理，以及胶辊、胶圈主要技术性能与纺纱工艺之间的关系。

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There was a large, low-ceiled room, with clacking, rattling machines at which men in white shirt sleeves and blue gingham aprons were working.

那是个天棚很低的大房间，里面排列着发出隆隆声响的机器。

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