sphenoid part

基本解释

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.
無論哪種情況，楔形躰的橫截麪形狀要麽是有兩條邊相同的球形四邊形，要麽是任意球形四邊形。
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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.
圓錐楔形躰的結搆至少有四個圓錐麪組成，在每個麪上，可以使用相同的橫截麪，也可用不同的橫截麪。
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