文中提出的螺旋运动方程对闭式运动链，即空间机构同样适用。
The screw motion equation presented is also suitable for closed chains, i. e. spatial mechanisms.
针对螺旋伞齿轮开式模锻存在的问题，提出了螺旋伞齿轮闭式精锻新工艺及其模具结构。
The problems of open-die forging for spiral bevel gears are described. A new process and new structure principle of die for closed precision die forging of spiral bevel gears are presented.
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