The top and bottom are traditional cotton, while the middle core is an elastic, synthetic material that compresses your abdomen.
顶部和底部是棉花，而中间是一种弹性的合成材料，压缩你的腹部。
2
It is the intention of this paper to explain the basic principles of synthetic elastometry and the methods of repeated trials with the "Elastic Frictoinal Tester of Filament Yarn".
本文主要说明长丝纱线弹性综合测定的原理和用长丝纱线弹性摩擦系数测试仪进行定延伸率重复测试的方法。
3
This principle, which is an extension of the principle that the maximum synthetic working stress is minimum, shows that the elastic working range of the bowl is maximum.