blasto-

例句：

1. 1. The blasto-cells are the first cells to form in the embryo.
   胚芽细胞是胚胎中最早形成的细胞。
2. 2. The blasto-pore is the opening through which the eggshell breaks.
   胚孔是卵壳破裂的开口。
3. 3. The blasto-disc is a layer of tissue that forms around the developing embryo.
   胚盘是围绕发育中的胚胎形成的一层组织。