adj.六价的
"lead, cadmium, sexivalent chromium" 铅、镉、六价铬
Keywords active carbon;deep-colored leather;sexivalent chromium ion（ Cr（VI））;dyestuff;de-coloring; 活性炭;深色革;六价铬离子;染料;吸附脱色;
sexivalent - chromium 六价铬
