Tom is a student and he can buy a fitness band for 640 yuan.

汤姆是一个学生，他可以花640元买一个健身带。

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LUMA offers systems that can produce between 2, 400 and 8, 640 watts of electricity.

卢马公司提供可建设2400 ~ 8640 W电能的系统。

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But, you also can't ignore that buying both would cost $640 and require carrying both devices.

但是，你同样也别忘记了两者都买要花费640美元，并且两个设备都得带。

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