复数： electrophori

Volta had already created the electrophorus to create static electric charges and discovered methane before becomingprofessor of physics at the university of pavia in 1779 .

之前伏打已经发明了能够产生静电荷的起电盘，在1779年成为帕维亚大学物理教授之前还发现了甲烷。