目的：观察细胞浓度对造血干细胞冻存效果的影响。
Objective:To obsreve the effect of cell concentration on hemopoietic stem cell cryopreservation.
本文还提出了地下蓄能温度“理想域值”的概念，可作为评价能量蓄存效果的重要指标。
Besides, a concept of ideal temperature domain of underground energy storage was presented as an important index to evaluate the effect of energy storage.
目前，脐血造血干细胞的低温保存主要采用的是慢速冻存方法，但是这种方法的冻存效果以及冻存技术还有需要提高和完善的地方。
At present, slow cooling is the adopted method for long-term storage for HSCs but as a conventional method, it has many disadvantages.
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