puzzle over problem 为问题伤脑筋 Tao Zi, I puzzle over the meaning of life. 仓里满：“陶子，我对于生命的意义感到困惑。
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I have been pondering over this problem for quite a long time but still couldn't puzzle it out.
我想这个问题想了很久，但还是想不出答案。
I saw him puzzle over a math problem.
我看见他正在苦心思索一道数学题。
Defining obesity has been a puzzle over the years due to the different conclusions that people come up with linking to the causes of the health problem.
肥胖的定义在这几年来已经成为了一个迷题，原因在于人们想出了各种可能引起健康问题的结论。
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