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Explore the fundamental concepts of elementary number theory in this comprehensive lecture delivered in Chinese. Delve into core mathematical principles including divisibility, prime numbers, greatest common divisors, modular arithmetic, and Diophantine equations. Learn essential theorems and proof techniques that form the foundation of number theory, with practical problem-solving approaches suitable for advanced mathematics students. Master key topics such as the Euclidean algorithm, Chinese Remainder Theorem, and properties of integers through rigorous mathematical exposition. Gain insights into how these theoretical concepts apply to various mathematical contexts and develop strong analytical skills for tackling complex number theory problems.