“listen with half an ear”别理解成“用半只耳朵听”，其正确的含义是心不在焉地听；似听非听。

【例句】
Unfortunately, I don't remember what Mom said because I was only listening with half an ear while the game was on TV.
可惜的是，我不记得妈妈说了什么，因为电视上播放比赛时，我是心不在焉地听。

She listened to the news with half an ear as she cleaned the bathroom.
她一边打扫卫生间，一边心不在焉地听着新闻。