not be just a pretty face idiom humorous
不只是一张漂亮脸蛋；不只是徒有其表
If someone is not just a pretty face, they are not only attractive but also intelligent.
"How did you know that?" "Well, I'm not just a pretty face, you know." “你是怎么知道的？”“嘿！我不只是徒有其表，你知道的。”