Happiness: The source and driving force for us to make advertisements.

快乐：我们做广告的源泉和动力。

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And draw the conclusion: the source motive force of the modern economic growth is the progress of technology.

得出结论为：现代经济增长的源动力是技术进步。

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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。

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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。

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