resonant amplifier

例句：

1. 1. The sound of the piano is resonant and beautiful.
   钢琴的声音是共振的，很美妙。
2. 2.The crystals have a resonant frequency that matches the frequency of the light.
   这些晶体有一个与光的频率相匹配的共振频率。
3. 3. The resonance of the spring has been affected by the weight on it.
   弹簧的共振受到了它上面的重量的影响。