electrodynamics

e.lec.tro.dy.nam.ics

n.(used with a sing. verb)（名词）（与单数动词连用）
The physics of the relationship between electric current and magnetic or mechanical phenomena.
电动力学：关于电流和磁铁或机械现象的关系的物理学

【引伸】
elec.trodynam.ic
adj.（形容词）