女孩们注视着，脸上挂着调皮的微笑，显得愈加活泼。The girls watched, little teasing smiles animating their faces.伯格侧着头，脸上掠过一丝调皮的神情。Berg tilts his head and a mischievous look crosses his face.我们只是坐在那儿像调皮的小学生一样的咯咯地傻笑.We just sat there giggling like...

“调皮的”的英语可以翻译为：piquant ...