In conventional high-heeled shoes, the heel is much higher than the rest of the shoe, causing the wearer to place their foot at an Angle.
传统的高跟鞋一般都是鞋跟部分要比鞋底高出很多，我们穿着的时候脚其实是位于一个三角形的支架上。
Foot&Leg health factor (or longevity factor) F2 consists of foot angle, foot heel depth and rear legs-rear view.
F2为肢蹄因子（或者称为长寿因子），它包括蹄角度、蹄踵深度和后肢侧视。
Using the mean draft, heel Angle and trim Angle as the design variables, it need not calculate tangent values of the angles and is more convenient for application.
设计变量直接取吃水、横倾角和纵倾角，不必预先计算倾角的正切值，使用方便。
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