in sober earnest

例句：

1. 1. He spoke in sober earnestabout the importance of education.
   他严肃认真地谈论了教育的重要性。
2. 2. She was soberearnest in her work, always strivingfor excellence.
   她在工作上非常认真，总是追求卓越。
3. 3. The teacher spoke in sober earnest to emphasize the importance of teamwork.
   老师严肃认真地讲话，强调团队合作的重要性。