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.Figure 4 - 2 a present - day laboratory version of the electroscope....

electroscope的音标：electroscope的英式发音音标为：[ɪ'lektrəskəʊp]electroscope的美式发音音标为：[ɪ'lektrəˌskoʊp]...

n.验电器...