a basic type of cell which can divide and develop into cells with particular functions. All the different kinds of cells in the human body develop from stem cells干细胞.
Stem cells are the key to the body’s ability to renew itself.干细胞是人体自我更新能力的关键。
Tests suggest that stem cells could be used to regenerate damaged body parts.测试表明，干细胞可用于再生受损的身体部位。
Stem cell research is the essential first step for cloning.干细胞研究是克隆必不可少的第一步。