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it should be noted that the changes introduced in 2010 are not the first revisions made to the index -- indeed there were major revisions, including the introduction of mean years of schooling as an additional measure of knowledge in 1991, fixed goalposts in 1994 and the reintroduction of the logarithmically transformed and capped gross domestic product (gdp) in 1999.
应指出的是,2010年引入的变动并非对人类发展指数所做的首次修正 -- -- 实际上进行了几次较大的修正,包括1991年将平均受教育年数作为知识的新增衡量标准的引入、1994年对固定目标的引入和1999年对经对数转换和设有上限的国内生产总值的引入。