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简介：Fifth, the climate is difficult and the water and soil are unsuitable. From a historical perspective, the biggest obstacle to the Chinese dynasty's conquest of Burma was not the enemy's troops, but the humid and miasmatic climate. From Zhuge Liang's conquest of Menghuo to Liu Wei and Deng Zilong's expedition to the southwest, , the number of Han soldiers who died or lost combat effectiveness due to illness was much higher than the number of casualties on the battlefield.