The theory of cancer stem cell proposes that the tumor tissue has its own cancer stem cells in it and regards cancer stem cell as the key to regeneration, metastasis and recurrence.

肿瘤干细胞学说认为，肿瘤组织中也存在少量具有干细胞性质的肿瘤干细胞，肿瘤干细胞是肿瘤发生、转移和复发的关键。

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The content related to purification technique for sodium is discussed. It includes impurity concentration, purification theory, clod trap, efficiency, regeneration and so on.

本文叙述了与钠净化技术有关的内容，包括钠中杂质浓度、净化理论、冷阱效率和冷阱再生等问题。

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Based on the bipolar particle electrode theory, a new regeneration method was suggested.

根据复极性粒子群电极理论，提出了新的活性炭再生方法。

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