换一批
换一批摘要篇首：China have a vast territory and a large population. It is situated between north latitude 2°-58° and east longitude 74°-135°. Most of China is lacated in the temperate and subtropical zones, with a small part in the tropical zone. Due to the influence of monsoons from the Pacific Ocean during the summer season, rainfall is plentful, and the weather can be hot and humid. The natural conditions create a good environment for the rise and spread of most tropical diseases (infectious and parasitic diseases), especially in South-eastern China, where about 80% of the population lives.
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