有一天我接到一位客户的电话，她的问题我没办法解决。她的问题是：打印机不能打出来黄色，但是其它颜色都正常。这让我觉得很纳闷……

I had been doing Tech Support for Hewlett-Packard's DeskJet division for about a month when I had a customer call with a problem I just couldn't solve. She could not print yellow. All the other colors would print fine， which tru

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