To counteract the anemia of sickle cell disease, the bone marrow makes increased numbers of reticulocytes, which are immature red blood cells.

为代偿镰状细胞贫血，骨髓造血活跃并产生大量网织红细胞，即尚未完全成熟的红细胞。

It’s a blood cancer that occurs when a person’s bone marrow starts churning out immature and abnormal white blood cells.

这是一种血癌，当一个人的骨髓开始大量产生不成熟和异常的白细胞时就会发生。

Each primordial follicle has a single immature sex cell called the primary oocyte at the core, and a layer of follicular cells surrounds this.

每一个始基卵泡中心都有一个未成熟的生殖细胞，叫做初级卵母细胞，被卵泡细胞包裹。

With this in mind researchers at Wake Forest University in North Carolina have used a three-dimensional printer to produce an artificial kidney using immature kidney cells.

为了实现这个梦想，北卡罗来纳州（North Carolina）维克森林大学（Wake Forest University）的研究员们使用三维打印技术，用不成熟的肾脏细胞做出了一个人造肾脏。

Each follicle is initially made up of an immature sex cell, or primary oocyte, which is the female sex cell, and layers of theca and granulosa cells surrounding the oocyte.

每个卵泡最初是由未成熟的生殖细胞：初级卵母细胞（即女性生殖细胞）和卵母细胞外层的鞘细胞、颗粒细胞组成。