Congenital syphilis says the embryo passes syphilis again, it is syphilis helicoid to infect fetal syphilis via placenta. 先天梅毒又称胎传梅毒，乃梅毒螺旋体经胎盘传染给胎儿之梅毒。
To the dog pathogenesis is the hemorrhagic yellow helicoid and the dog hook end helicoid two blood serums. 对狗致病的是出血性黄疸螺旋体和犬钩端螺旋体两个血清型。
The helicoid equation of contacting surface befween workpiece and die in the process of cross wedge roiling was proposed in this paper. 建立了楔横轧变形工件与模具接触面的旋转螺旋面方程。
