amplitude of the molecular vibration

例句：

1. 1. The sound has an amplitudeof 50 decibels.
   这个声音的振幅是50分贝。
2. 2. The amplitude of the wave is directlyproportional to its frequency.
   波的振幅与频率成正比。
3. 3. The amplitude of the signalcan be measured using a spectrum analyzer.
   信号的振幅可以通过频谱分析仪来测量。