But if the control electrode was given a negative charge, it would prevent the flow of electrons.

但如果向控制电极施加负电荷，它将阻止电子流动。

By applying a positive charge to the control electrode, it would permit the flow of electrons as before.

通过向控制电极施加正电荷使得电子可以流动。

Luckily, shortly after, in 1906, American inventor Lee de Forest added a third " control" electrode that sits between the two electrodes in Fleming's design.

幸运的是，不久之后的 1906 年，美国发明家李·德富雷斯特参考弗莱明的设计，在两个电极间加入了第三个" 控制" 电极。