Tā de bóshì lùnwén yánjiū de shì Kāngdé de zhīshilùn.
His doctoral thesis studies Kant's epistemology.
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知识论 (epistemology) and 认识论 (rènshilùn) are largely synonymous, but 认识论 is more common in Marxist/Chinese philosophy contexts, while 知识论 leans toward Anglo-analytic philosophy.