Studies on eunuch institutions has been a major subject in Chinese historical studies.

中国宦官制度的研究，历来成为中国历史研究中的重要课题。

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In some cases the labor expended on these historical studies was out of proportion to the result achieved.

在某些情况下，花费在这种历史研究的劳动同其所取得的成果很不相称。

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These new researches should be discussed to benefit us to re-analyse the research methods in historical studies.

“金匮之盟”真伪之争的学术讨论，也会促使学界对历史研究方法的反思。

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However, as with the plays, petitioner did not realize any income from the historical studies.

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Petitioner alleges that he stopped writing plays and started writing historical studies in an attempt to improve profitability.

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Charles Kindleberger has shown in his historical studies of financial crises.

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