Conclusion Melanosis coli is inflammation,benign,reversibility chromatosis as characteristic,the disease is related to taking anthracene for long time constipation.

结论结肠黑变病是结肠的一种非炎症性、良性、可逆性的以色素沉着为特征的病变,该病的发生与秘服用蒽琨类泻剂有。

The reversible gel is a kind of high molecular polymer.It has peculiar thermal invertibility and peculiar thermal sensitivity.

热可逆凝胶是一种高合物，具用独特的热可逆性。

This paper is a study on the invertibility of the commutator of scalar-idempotent elements and scalar-involutory elements of a unitary ring.

本文研究在一个有单位元的环中两个倍幂等元的换位与两个倍对合元的换位的可逆性问题。