a. concerned with work or important matters rather than play or trivialities
s. of great consequence
s. requiring effort or concentration; complex and not easy to answer or solve
a. 严肃的, 认真的, 重要的, 严重的
[电] 严重的
1. She is serious about her studies and always does her homework on time.
她对学习很认真，总是按时完成作业。
2. It’s a serious problem that we need to solve quickly.
这是一个我们需要迅速解决的严重问题。
3. He gave me a serious look when I told him my plan.
当我告诉他我的计划时，他用严肃的表情看着我。