美国癌症协会(ALS)在今后六年中,将对美国人的生活方式与环境进行研究,试图了解疾病的发病率与其变化的关系,尤其是癌症的发病率。本次研究于去年九月一日开始,将持续到1988年,期间将有一百万以上的美国人参加。一年前在这一计划首次公布时,当时估计至少得化费一千万美 In the next six years, the American Cancer Society (ALS) will study the American way of life and environment in an attempt to understand the relationship between disease morbidity and its changes, especially the incidence of cancer. The study, which started on September 1 last year and will last until 1988, will have over one million Americans participating. When the plan was first announced a year ago, it was estimated that it would have cost at least 10 million U.S. dollars