1、The major scale is a sequence of seven chords, each formed by playing every other note in a different key.
主音阶是由七个和弦组成的序列，每个和弦都由在不同的调式中每隔一个音符形成。
2、In music theory, a chordal instrument is capable of playing multiple notes simultaneously, such as a piano or guitar.
在音乐理论中，和弦乐器可以同时演奏多个音符，比如钢琴或吉他。