The body of the pipa is pear-shaped, while the sound box of Ruan is round; the pipa is a musical instrument from the Western Regions in ancient times, and the ruan is a traditional musical instrument in my country; when the pipa is played, the armor is used, and Ruan is playing Picks are used when playing; Pipa's timbre is clearer and softer, while Ruan's timbre is thicker. Ruan i...