The secondary yolk sac

• 卵黄囊

The secondary yolk sac的用法和样例：

例句

1. The yolk sac is gradually vascularized.
   卵黄囊逐渐被血管化了。
2. The dye Trypan Blue has a remarkable biphasic effect on pinocytosis by yolk sal.
   染料锥虫蓝对卵黄囊的胞饮作用具有明显的双向作用。