electroscope voltage detector

• 试电笔； 验电器

electroscope voltage detector的用法和样例：

例句

1. The leaves of the electroscope slowly diverge.
   验电器的叶片慢慢张开。
2. Her electroscope was a metal case with two holes in its side.
   她的验电器是一个金属盒子，旁边有两个小孔。