求翻译：第一，舒适感。真丝绸是由蛋白纤维组成的，与人体有极好的生物相容性，加之表面光滑，其对人体的摩擦刺激系数在各类纤维中是最低的，仅为7.4%。是什么意思？

First, the comfort. Silk is composed of protein fibers, has an excellent biocompatibility with the human body, combined with a smooth surface, to stimulate its coefficient of friction on the human body in all kinds of fiber is the lowest, only 7.4%.

First of all, comfort. Silk is a protein fiber really, consisting of a human body with excellent biocompatibility and the smooth surface, its effect on the human body, stimulate friction coefficient in the types of fiber, only the minimum of 7.4 per cent.

First, comfort.The real silk is composed by the egg albumin fiber, has the extremely good biological compatibility with the human body, adds the surface to be smooth, it to the human body friction stimulation coefficient in each kind of textile fiber is lowest, is only 7.4%.

First, the comfort. Silk is made up of protein fibers, and the human body has an excellent biocompatibility, coupled with smooth surface and coefficient of friction and stimulation to human is the lowest in the various kinds of fiber, only 7.4%.

First, the comfort. Silk is composed of protein fibers, has an excellent biocompatibility with the human body, combined with a smooth surface, to stimulate its coefficient of friction on the human body in all kinds of fiber is the lowest, only 7.4%.