当人们从外界给某个物体加上一个振动(称为策动)时,如果策动力的频率与该物体的固有频率正好相同,物体振动的振幅达到最大,这种现象叫做共振．物体产生共振时,由于它能从外界的策动源处获取最多的能量,往往会产生 When people add a vibration to an object from the outside world (called invite), if the frequency of the power is exactly the same as the natural frequency of the object, the amplitude of the vibration of the object reaches its maximum. This phenomenon is called resonance. When an object resonates, it will often generate energy because it can get the most energy from outside sources.