He's been cudgeling his brain all day over this problem.
他整天都在为这个问题伤透脑筋。
2
He's been cudgeling his brains all day over this problem.
他整天都在为这个问题费脑筋。
3
The thoughts of our sage Confucius, however, were born through questions and replies with his disciples during their drifts in various kingdoms instead of cudgeling his brains in his study.