这些调弦可以让吉他手弹出开放七, 九, 十一,或十三和弦.These tunings allow a guitarist to play an open seventh, ninth, eleventh or thirteenth chord.但这些调弦是一种介于开放式调弦与变化调弦之间的调弦.But these are in kind amiddle ground between standard Open Tunings and A...