求翻译：Convincing people to buy the product proved challenging. Not only was Bio Oil a multi-use product when almost every other product was single-use, but oils were perceived to be greasy, and not skin-friendly like creams. Bio Oil however developed an intensely loyal following over the years with those who ventured to try it, and Union Swiss began receiving passionate feedback about how this “skin tonic” had worked for是什么意思？

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