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

结论结肠黑变是结肠一种非炎症性、良性、性以色素沉着为特变,该发生与长期便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.

凝胶是一种高分子聚合物，具用独特性。

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环中两个倍幂等元换位子与两个倍对合元换位子性问题。