(located) at; (to be) in; to exist; in the middle of doing sth; (indicating an action in progress)[cedict]
对牛弹琴
duì niú tán qínㄉㄨㄟˋ ㄋㄧㄡˊ ㄊㄢˊ ㄑㄧㄣˊ
to play the lute to a cow (成语 saw); fig. offering a treat to a unappreciative audience; to cast pearls before swine; caviar to the general; to preach to deaf ears; to talk over sb's head[cedict]