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20世纪前半叶，世人饱受着战争、贫困和疾病的折磨和痛苦。二战结束后联合国成立，人们渴求和平的愿望渐趋现实。世界卫生组织（WHO）于1948年应运诞生，即致力于消灭人类的恶性传播性疾病。世纪后半叶的世界虽仍动荡不安，点星战火此起彼伏，国家、民族间的贫富悬殊依然存在，
In the first half of the 20th century, the world suffered from war, poverty, and disease. After the end of World War II, the establishment of the United Nations, people’s desire for craving for peace became more realistic. The World Health Organization (WHO) was born in 1948 to work to eradicate human malignant transmission diseases. Although the world in the second half of the 20th century is still turbulent, star-studded warfare has risen one after another, and the disparity between the rich and the poor among nations and nations still exists.