The work piece can be clad with lagging materials immediately after overlay and adopt slow cooling method on the basis of different principle material and complicated shape of the work piece.
根据工基体材质的不同情况和工件形状的复杂程序，也可采用堆焊后立即有保温材料包覆，然后缓冷的处理方法。
At present, slow cooling is the adopted method for long-term storage for HSCs but as a conventional method, it has many disadvantages.
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。
Using the method of program cooling speed is slow, has small damage to the cells.
程序降温法降温速度较缓，对细胞的损伤小，保存的长期性和安全性均可得到保障。
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