5 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. 她优雅地拨动着竖琴的琴弦。

   tā yōu​yǎ de bō​dòng zhe shù​qín de qín​xián.

   She gracefully plucked the strings of the harp.

   Source: Dong Chinese Dictionary

3. 乐师正全神贯注地拨动着瑟的琴弦。

   yuè​shī zhèng quán​shén​guàn​zhù de bō​dòng zhe sè de qín​xián.

   The musician is concentrating on plucking the strings of the se.

   Source: Dong Chinese Dictionary

4. 由于琴弦老化，这架钢琴的音律有些失调。

   yóu​yú qín​xián lǎo​huà, zhè jià gāng​qín de yīn​lǜ yǒu​xiē shī​diào.

   Due to aging strings, the piano is a bit out of tune.

   Source: Dong Chinese Dictionary

5. 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