成语“对牛弹琴”，即对不懂道理的人讲道理，对外行人说内行话。若对此成语细加推究，不难得出这样的结论：牛，兽类；弹琴者，人也。五音六律，惟人熟耳；“牛”不懂琴音，理固宜然。可见“牛”受抱怨，实在是无辜的，其过完全在不问对象“乱弹琴”的人。若要“牛”懂，唯有 Idiom “on the harps,” that is, people who do not understand the truth reason, to laypeople to speak jargon. If this idiom elaborate, it is not difficult to come to such a conclusion: cattle, mammals; Five-tone six-law, but people familiar ear; “cow” do not understand Qin tone, rationale should be solid. Visible “cow” is complaining, it is innocent, and its completely do not ask the object “chaotic piano” people. To “cow” understand, only