Whatever the case, the shape of the cross-section of the said sphenoid part is either of an isosceles spherical trapezium or of any spherical quadrilateral.
无论哪种情况，楔形体的横截面形状要么是有两条边相同的球形四边形，要么是任意球形四边形。
Their conical sphenoid part, for the configuration of which at least four conical surfaces are used, can have the same cross section all over its length or different cross-section per parts.
圆锥楔形体的结构至少有四个圆锥面组成，在每个面上，可以使用相同的横截面，也可用不同的横截面。
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