In an article published in the journal Science, four scholars say racial categories need to be phased out.
调整语序、用词：在《科学》杂志上发表的一篇文章中，四位学者表示，种族的划分需要被逐步淘汰。
Under the pressure from mixed-race Americans and their parents, the census bureau changed its rules to allow people to identify themselves by as many as five official racial categories.
迫于来自混血美国人及其父母的压力，人口统计局更改了其规定，允许人们根据多达五种官方承认的种族范畴将自己归类。
Yet the racial categories laid down under apartheid are still widely used, the only difference being that people now choose their own classification rather than having it foisted on them.
种族隔离时期产生的种族分类至今仍大行其道，唯一的不同只在于人们不再被强制分类而是可以选择自己所属的阶层。
Up till now, most of the research and studies on American racial problem can be divided into two categories: historical and sociological.
综合国内及美国本土学者的研究成果，我们大致可以将美国的种族问题研究划分为历史研究和社会学研究两大类。
Up till now, most of the research and studies on American racial problem can be divided into two categories: historical and sociological.
综合国内及美国本土学者的研究成果，我们大致可以将美国的种族问题研究划分为历史研究和社会学研究两大类。
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