“till the cows come home”别理解成“等到奶牛回家”，正确的含义是指长时间地；很久；无限期；永远。

【例句】
We were having so much fun that we decided to stay at the party until the cows came home.
我们过得如此开心，以至于我们决定在派对上待很久。

You can talk till the cows come home—you’ll never make me change my mind.
你就是说破天，也没法让我改变主意。