Think hard
Worry, worry, worry, worry, worry, worry, worry, worry. It's from experience.
Idiom explanation
Worry and think.
The origin of Idioms
Zou Taofen's experience: "all my attention at this time is focused on the invasion of Suiyuan. What I worry about everyday is this problem."
Idiom usage
As a predicate, adverbial, or bitter thought
Think hard
the weather in autumn is as hot as in summer - qiū xíng xià líng
Analysis of liver and gallbladder - xī gān guì dǎn