longitudinal section in center plane
中纵剖面线 zero buttock
纵中剖面结构图 central fore-and-aft plane construction plan
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添加剂均匀分布在整个纤维的横截面和纵剖面中。根据使用的添加剂，显示出相对光滑的或颗粒状的粗糙表面。
The additives are uniformly distributed throughout the fiber cross section and longitudinal sections show relatively smooth or grainy, rough surfaces depending on the additive used.
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