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?
一般电源电压220伏或380伏，必要时配置可调节电压的中间变压器。
The general power supply voltage 220 v or 380 v, the middle of the configuration of adjustable voltage transformer when necessary.
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