一名熟知迈克尔·杰克逊死因调查案的执法人员表示，当局认为杰克逊的私人医生所开具的强效药物杀死了这位流行歌王。
A law enforcement official with knowledge of the investigation into Michael Jackson's death says the pop star's personal doctor administered the powerful drug that authorities believe killed him.
方法：利用减寿年数和减寿率分析指标对山东省1990～ 1992年全死因调查中的肿瘤死亡资料进行分析。
Methods:The index potential years of life lost (PYLL) and rate of PYLL were used to analyze the cancer death data of all death survey from 1990-1992 in Shandong province.
通过160名卷烟工人的死因调查，死于呼吸系统疾病的居首位，占37.5%，说明烟草尘是损害肺脏的有害粉尘。
The retrospective study on 160 workers exposed to tobacco dust showed that 37.5% of diseases of respiratory system headed the list of the causes of death.
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