求翻译：许多专家也告诉记者，发达国家现代零售业的利润，绝大多数都是来源于自身经营，赚取产品的购销差价。对供货商收取的促销服务费用占利润的比例很低，一般都不到百分之十.是什么意思？

Many experts also told reporters that the profits of modern retailing in developed countries, the vast majority comes from its own operations, buying and selling products to make the difference. Collection of suppliers of promotional services accounted for the low percentage of profits, are generall

Many experts also told the reporter that developed modern retail industry, and the overwhelming majority of profits are derived from their own business and earned the buying and selling products post. To promote service providers in the fee is a percentage of the profit rate is too low, generally le

Many experts also tell reporter, the developed country modern retail trade profit, the overwhelming majority all is originates from own management, earns the product the difference between buying and selling price.The promotion service expense gathers which to the supplier occupies the profit the pr

Many experts also told reporters that the modern retail profits in developed countries, mostly from their own business to earn product difference. To promote services charged by the supplier costs accounted for a very small percentage of the profits are generally less than 10%.

Many experts also told reporters that the profits of modern retailing in developed countries, the vast majority comes from its own operations, buying and selling products to make the difference. Collection of suppliers of promotional services accounted for the low percentage of profits, are generall