It's played by a traditional Chinese instrument called the erhu.

是由中国的古典乐器二胡演奏出来的

耶鲁公开课 - 聆听音乐课程节选

Let's listen to an erhu play a melody by a traditional Chinese composer— we call him in English "Abbing" and you can read about him there in your textbook.

让我们听听一段二胡旋律吧,它由一位中国早年的作曲家创作,英语中我们称呼他Abbing,当然,课本上有他相关的信息

耶鲁公开课 - 聆听音乐课程节选