Professor Li Yusen for their invaluable guidance and support throughout my thesis journey. Their expertise, dedication, and encouragement have been instrumental in helping me achieve my academic goals.Prof. Cai Wentong provided me with insightful feedback, suggestions on my thesis topic, and guidance on my research methodology, data analysis, and manuscript writing. I am grateful for his patience and willingness to invest his time and expertise in helping me develop a high-quality thesis.Associate Prof. Li Yusen o↵ered me a lot of advice which helped me refine my research questions and develop a clear and compelling argument. I appreciate his willingness to engage in stimulating discussions and provide constructive feedback on my work.