对全国20个油毡厂工人的癌症和其它几种慢性病进行了比例死亡比的研究。
A study on proportional mortality ratio of cancer and some other chronic diseases among workers in 20 asphalt felt-making factories is reported.
但很难说儿童猪流感死亡就比季节性流感有更高比例。
But it's hard to say whether children account for a higher proportion of deaths from swine flu than they do from seasonal flu.
在美国心血管疾病是导致死亡的最主要病因，每年因此而死亡的人数比所有因癌症死亡的人数加起来还要多，占死亡总人数的比例接近三分之一。
Cardiovascular disease is the leading cause of death in the United States.
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