1、The vitellogenic cells produce the yolk protein that is required for embryo development.
成卵细胞产生胚胎发育所需的卵黄蛋白。

2、The vitellogenic stage in insects is characterized by the accumulation of yolk proteins in the developing oocytes.
昆虫的成卵阶段以卵母细胞中卵黄蛋白的积累为特征。