Three kinds of flight cross sections were researched including rectangular section, hackle section and trapezoid section.
本文讨论的螺纹断面形状为三种:矩形断面 、 锯齿形断面,梯形断面.
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Restrain damage of hair , eliminate hair shed, make the hair better and easy hackle.
修护因各种原因对秀发造成的损伤,长效滋养秀发防止脱落, 使秀发更易梳理,令您的秀发亮泽出众.
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