小提琴的弦走调了。

The violin's ___string was out of tune.

那位吉他手，刚刚弄断了吉他的一根弦，开始喝一些酒。

The guitarist, who had just broken one ___string of his guitar, began to drink some alcohol.

你应该定期更换乐器上的弦。

You should change the ___string on your instrument regularly.