3 sentences

1. 琴弦的振动产生了声音。

   qín​xián de zhèn​dòng chǎn​shēng le shēng​yīn.

   The vibration of the strings produces sound.

   Source: Dong Chinese Dictionary

2. 这种乐器通过弦的振动而发音。

   zhè zhǒng yuè​qì tōng​guò xián de zhèn​dòng ér fā​yīn.

   This instrument produces sound through the vibration of its strings.

   Source: Dong Chinese Dictionary

3. 这种乐器是通过空气振动而发声的。

   zhè zhǒng yuè​qì shì tōng​guò kōng​qì zhèn​dòng ér fā​shēng de.

   This instrument produces sound through air vibration.

   Source: Dong Chinese Dictionary