While these magazine apps are often free on the iPad and iPhone, purchasing the actual issues costs extra.

尽管在iPad和iPhone上这些电子杂志通常是免费的，购买真实期刊才额外收费。

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"Purchasing golden winner" of "purchase" magazine in the United States, summarized life experience that the service value should be sure suppliers.

美国《采购》杂志“采购金牌”得主，总结一生之经验，有一点就是要肯定供应商的服务价值。

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Mr. SILVIO PIETROLUONGO (Chart Manager, Billboard Magazine): Back when 45 singles were the mode of purchasing choice, record labels really released one song physically, you know, every few months.

NPR: On Billboard Chart, No Longer Lonely At Top