surface sheath 表面鞘
A certain degree of free fibrillar structure was observed on the fiber surface due to the sheath structure of the fiber subjected to the greater drawing and orientation.
纺丝过程中纤维皮层结构受到更大的拉伸取向作用，并在纤维表面出现一定游离原纤化结构。
Based on the rf (radio frequency) sheath model, the equation for ion momentum when reaching the material surface was derived.
利用射频鞘层模型，推出了离子到达被加工材料表面时的动量的表达式。
The hair shaft and inner root sheath move together as the hair grows toward the surface: the outer root sheath remains fixed in position.
毛干和内根鞘当到达体表时融合在一起：外根鞘仍然保持在原来的位置。
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