bluegrass
noun [ U ] uk/ˈbluː.ɡrɑːs/ us/ˈbluː.ɡræs/
蓝草音乐（美国南部的一种乡村音乐，用吉他、班卓琴、小提琴等弦乐器演奏）
a type of country music from the southern US played on instruments such as guitars, banjos, and violins
草地早熟禾（一种蓝绿色的牧草，在美国常用作动物饲料、草坪、运动场等）
a type of bluish-green grass that is commonly used in the US for animal feed and for lawns, sports fields, etc.