单词	凹下部分
释义	凹下部分negative element
随便看	poly(vinyl acetate) {= pvac} polyvinyl alchol polyvinyl alchol (pva) polyvinyl alchol {=pva} poly(vinyl alcohol) polyvinyl alcohol polyvinylalcohol polyvinyl alcohol fiber polyvinyl alcohol fibre poly(vinyl alcohol) {= pva} polyvinyl alcohol {= pva} polyvinyl alcohol {=pva} polyvinyl alcohol-- pva polyvinyl alcohol; pva polyvinyl alcohol{=pva} polyvinylamine poly(vinyl butyral) polyvinyl butyral polyvinylbutyral poly(vinyl butyral) {= pvb} polyvinyl butyral resin polyvinyl carbazole polyvinylcarbazole poly (vinylchloride) poly(vinyl chloride)