织物输送带是由不同的层，其中拉伸强度是由化纤织物铺层提供。
Fabric conveyor belts are made of various layers, where the tensile strength is provided by synthetic fabric plies.
目前有成打的甚至是上百种拉伸方法你可以用来放松你的肌肉，也有完全介绍这个话题的书籍，其中最好的一本是Bob Anderson写的《拉伸》。
There are dozens, even hundreds, of stretches that you can do to loosen your muscles. Entire books have been written on the subject.
究其原因，其中很重要的一条便是对于金属带材拉伸弯曲矫直的变形机理还缺乏深入系统的研究。
It is one of the important reasons that the research on the metal strip deformation mechanism of tension leveling is not sufficient and systematical enough yet.
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