The influence of percentage of spandex, drafting ratio of spandex and twist of core spun yarn on tensile properties and elasticity of spandex core spun yarns on woolen spinning system were studied.

文章介绍了在纺制毛粗纺氨纶包芯纱时，氨纶百分含量、预牵伸倍数和捻度对包芯纱强伸性和弹性的影响规律；

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This is why NFL teams can turn around quickly: a good few seasons of drafting can build a core of young talent that offers great ROI compared to free agents.

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Using smart drafting, the team developed a core group of homegrown talent in Ryan Howard, Jimmy Rollins, Chase Utley and Cole Hamels.

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