It explains why Hoover found it very difficult to persuade the world that it was more than vacuum cleaners, and why companies like Unilever and P&amp;G keep brands separate, like Ariel and Pringles and Dove rather than having one giant parent brand.
这解释了为什么胡佛 发现很难让世界相信 他的公司不仅仅生产真空吸尘器， 也解释了为什么像联合利华和宝洁这样的公司 一直将品牌分割开来， 例如奥利奥、普林格和德芙 而不是有一个很大的母品牌。