n.验电器
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.
Figure 4 - 2 shows a present - day laboratory version of the electroscope.
图4 - 2就是目前实验室里的验电器样式.
The leaves of the electroscope slowly diverge.
验电器的叶片慢慢张开.