So I should say, I guess, that since the time of that original President Johnson report, and the various reports of the U.S. National Academy -- 1977, 1982, 1990 -- people always talked about this idea.
所以我想我应该说，自从约翰逊总统桌上放了那份最初的报道以来， 美国国立研究院的各种各样的报告—— 1977.1982，1990——人们总是在谈论这个观点。