These industries have learned that by focusing the debate on uncertainties in the science (and the need for more research), it is possible to avoid a debate on public policy. This can delay for years the expenditures required to protect people’s health and the environment.
这些行业已经明白了通过在科学的不确定性（以及进一步研究的需要）上纠缠就可能避免公共政策的辩论。这样做可以将保护人们健康和环境方面的必要支出延迟多年。