这两个测量读数之差的平均值就是我们所希望的电压差。
The average of the difference between these two readings is the desired voltage difference.
注意，电路中的电流必须通过电流表以测量到读数。
Note that the current must flow through the ammeter in order to reach the circuit.
注意，电路中的电流必须通过电流表以测量到读数。
Note that the current must flow through the ammeter in order to reach the circuit.
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