2 sentences for 波动 (bō​dòng — wave motion)

1. 这台地震仪能记录下微小的地壳波动。

   zhè tái dì​zhèn​yí néng jì​lù xià wēi​xiǎo de dì​qiào bō​dòng.

   This seismograph can record minute crustal fluctuations.

   Source: Dong Chinese Dictionary

2. 琴弦的波动通过共鸣箱发出了美妙的声音。

   qín​xián de bō​dòng tōng​guò gòng​míng xiāng fā​chū le měi​miào de shēng​yīn.

   The vibration of the strings produced a beautiful sound through the resonance box.

   Source: Dong Chinese Dictionary