Cephalic, or head-first, is the first type, and furthermore the most common and optimal presentation for easy delivery is a type of cephalic presentation called vertex, which includes complete flexion of the head as well.
头先露,第一种类型;进一步说,对于顺产来说最常见的、最佳的先露,是一种为先露的头先露,包括完整的头部俯屈。