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Happiness: The source and driving force for us to make advertisements.
快乐：我们做广告的源泉和动力。
youdao
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Cost is the source of value creation and the driving force of earning profit.
成本是价值创造的源泉，也是产生利润的驱动力。
youdao
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Cost is the source of value creation and the driving force of earning profit.
成本是价值创造的源泉，也是产生利润的驱动力。
youdao