始终购买可调温度的取暖器以节省使用成本。
Always buy a heater with thermostat control to save on running costs.
使用参考体系结构作为指导可以节省大量时间，从而降低成本。
A lot of this time can be saved by using a reference architecture as guidance thus reducing costs.
因此，当使用计算机节省的时间和计算机的成本相当时，我们就使用计算机。
Therefore, computers are used when the time saved by using a computer offsets its cost.
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