two stub tuner

例句：

1. 1.The old man used to play the guitar with a stub tuner in his hand.
   那位老人以前用断弦调音器弹奏吉他。
2. 2. She found a stub tuner in her bag and started playing a beautiful song.
   她在包里发现了一个断弦调音器，开始弹奏一首美妙的歌曲。
3. 3. The old man was using a stub tuner to tune up his guitar strings.
   那位老人正在使用断弦调音器来调整他的吉他弦。