比起传统的基于变压器制造的适配器，按需电量调节的充电法大大降低了不必要的浪费。
This matching makes the process of transfer far less wasteful than it is with a traditional transformer-based adaptor.
要是没有变压器来调节电压，远距离输送电力是不可能的。
Were there no transformers to adjust the voltage, long-distance transmission of electricity would be impossible?
要是没有变压器来调节电压，远距离输送电力是不可能的。
Were there no transformers to switch the voltage, long-distance transmission of electricity would be impossible?
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