Copernicus had thought long and hard about these problems and tried to find an answer.

哥白尼对这些问题曾经苦苦思索过很久，试图找出问题的答案。

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Copernicus had thought long and hard about these problems and tried to find an answer.

哥白尼苦苦思考这些成绩，试图找到答案。

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Copernicus had thought long and hard about these problems and tried to find an answer.

哥白尼苦苦思考这些成绩，试图找到答案。

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