serious-minded

例句：

1. 1.He is a serious-minded person who always thinks about the future.
   他是一个认真思考未来的人。
2. 2.She was serious-minded and didn't want to be distracted.
   她很认真，不想被分散注意力。
3. 3.The manager was serious-minded and made sure everything was done correctly.
   经理很认真，确保一切都做正确了。