wǒ / yǐ / jīng / jiě / shì / le / hǎo / jǐ / biàn / tā / hái / shi / bù / tīng / zhēn / shi / duì / niú / tán / qín

我已经解释了好几遍，他还是不听，真是对牛弹琴。

I have explained it several times, but he still will not listen—it is like talking to a brick wall.