方法：应用寿命表法求得接尘剂量与发病水平的关系。
Methods: Seek interrelation between dust dose and morbidity level with the method of life table.
不久，癌症发病率比全国水平高出数倍。
Soon after, cancer rates rise to several times the national average.
因此，从分子水平上进一步研究大肠癌的发病机制十分必要。
Thus, it is urgent to further study the molecular mechanisms of colorectal cancer.
目的：探讨佝偻病的发病及治疗与血铅水平的关系。
Objective: To discuss the relation of rickets and blood lead level.
目的：探讨佝偻病的发病及治疗与血铅水平的关系。
Objective: To discuss the relation of rickets and blood lead level.
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