Changden.常德changn.Chang: 长江；扬子江=Yangtze.changing internal energy改变内能Changcheng Steel Company攀长钢Changsha Forerunner Area长沙先导区Changgangshu oral liquid肠肛舒口服液changing weight function变权重函数Changweiqing oral liquid肠胃清Changlu Tanggu Salt Work长芦塘沽盐场changing characteristics变化特征Changjiang-Huaihe area江淮区Changing magnetic fields磁场变化