preservativen.防腐剂；预防法；预防药adj.保存的；有保存力的；防腐的preservative process防腐工序,防腐法Preservative formula保鲜剂preservative solution防腐液preservative activity防腐作用preservative of silage青贮保存剂Preservative technique保藏工艺preservative solutions保鲜剂preservative packaging保鲜包装preservative for paint油漆用防霉剂preservative treatment防腐处理