当科学家在探针上加一定电压时候，电子能够在它和样品表面之间跳跃，这个过程叫做量子隧穿。
When scientists apply a voltage to the finger, electrons can hop between it and the surface through a process called quantum tunneling.
其中两个探针提供恒定的电流，而另外两个探针测量一部分样品上的电压降。
While two contacts supply a constant current, the other two contacts measure the voltage drop across a portion of the sample.
电流从两个外部的探针加入，而电压降则在两个内部的探针之间测量。
The current is sourced through the two outer probes and the voltage drop is measured between the two inner probes.
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