凶杀在黑人男子中是主要死因。
在工业化国家,心血管疾病是主要死因。
In the industrialized world, cardiovascular diseases are the major cause of death.
这是15岁至29岁年轻人的主要死因。
They are the leading cause of death among young people aged 15-29 years.
In contrast, if you look at a U.S.City, ten years ago in 1997 for example, then people still died but they didn't die predominantly from infectious diseases.
相反,我们看美国的城市,例如在十年前,即一九九七年,人们还是会死亡,但是最主要的死因不再是感染性疾病
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