The way of communication between ancient civilizations is peaceful communication and violent collision. The following questions are answered accordingly.

1, Xiongnu invasion

2. Tibet's civil strife and Loulan civilization

3. Zhang Qian and Zheng He

4. Peaceful communication is conducive to the civilized development of agriculture, industry, handicrafts, culture and art, and violent collision is conducive to the civilized development of national spirit and comprehensive military capabilities. Each has his own strengths, and the pros and cons depend on his personal morality and outlook on life.

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