原因：富氧血是明红色，然而，含较少氧气的血变成黑色和蓝色调。
The cause: Oxygen-rich blood is bright red, while blood with less oxygen turns dark and bluish-colored.
人脐血中是否存在造血基质细胞及其生物学特点如何，脐血基质细胞能否在体外有效扩增，国内外相关的系统性研究较少。
The related systematic research is rather less in whether there exist hematopoietic stromal cells in HUCB, how about it's biological properties, and whether it can be expanded effectively in vitro?
深度治疗是怎么作用的？会因为在目标高血量的时候治疗得较少而难以保持目标的血线么？
Q. How does Deep Healing work? Will it heal severely less at high health that it is difficult to keep a target at a safe level of health?
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