leftmost cell

例句：

1. 1.The leftmost cell in the human body is the heart.
   人体最左边的细胞是心脏。
2. 2.The outermost layer of the skin is the epidermis.
   皮肤的最外层是表皮。
3. 3.The leftmost cell in the plant kingdom is the chloroplast.
   植物界最左边的细胞是叶绿体。