Things have improved immensely in both the developing and developed worlds. In the last 100 years, scientists have won many of the most important battles against infectious diseases, to the extent that poverty is now the main reason for a lack of treatment.
无论是在发展中国家还是发达国家人们的生活条件都获得了很大的改进。在过去100年间，科学家们在与传染病的斗争中取得了许多极其重大的胜利，以致现在贫穷成了疾病得不到治疗的主要原因。1900年全球的平均寿命是30岁，而今天是68岁。