What methods do you use to control food cost and operating expenses?
用什么方法去控制食品成本和运作的支出。
Operating expenses total $206,337 for every hour the president's plane is in the air.
“空军一号”每飞行一小时，运行总成本就高达206，337美元。
Operating expenses total $206,337 for every hour the president's plane is in the air.
“空军一号”每飞行一小时，运行总成本就高达206，337美元。
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