To Mark, I was not a problem to solve, a puzzle that needed working out.
对马克来说，我不是需要摆平的麻烦，不是尚待解决的谜题。
I saw him puzzle over a math problem.
我看见他正在苦心思索一道数学题。
An explanation, as of a problem or puzzle is called a solution.
解释如一个问题或难题等的解释就叫解答。
An explanation, as of a problem or puzzle is called a solution.
解释如一个问题或难题等的解释就叫解答。
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