The operating margin (measured by earnings before interest, taxes, depreciation and amortisation divided by revenues) fell from 53.2 per cent in the first half of last year to 51.6 per cent in 2009.是什么意思_The operating margin (measured by earnings before interest, taxes, depreciation and amortisation divided by revenues) fell from 53.2 per cent in the first half of last year to 51.6 per cent in 2009.在线翻译_英语_读音_用法_例句