tetrachord
n. 四弦琴；四弦乐器；四度音阶
例句
After knowing who Buffett is, a girl asks to the office, 'is our tetrachord teacher the 2nd wealthy person?
知道巴菲特是谁后，有个女孩到办公室问，我们的四弦琴老师是世界上第二富有的人？
