Much of the energy supplied to complicated machine with many moving parts is wasted in overcoming this opposition. 供给一台具有许多可转动部件的复杂机器的能量,有很多是在克服阻力中损耗掉了。
The moving part of an electromagnetic device such as a relay, buzzer, or loudspeaker. 电枢电磁装置的移动部分,如继电器,蜂音器或扬声器