What will be the proper mix in different risk groups, in different subtypes, in different backgrounds if the goal is to reach a vaccine -- one vaccine -- that could work for all people and nations?" But the researchers say the findings offer new hope for AIDS research.

VOA: standard.2009.10.20

The slave trade revolving around tobacco or cotton or coffee or sugar would tend to mix slaves and laborers from different language backgrounds, in part deliberately, so as to avoid the possibility of revolt.

为了获得烟草,棉花,咖啡,或糖块的奴隶交易,会将来自不同语言背景的奴隶,和劳动者们混在一起,这也在某种程度上,谨慎地避免了可能的造反

耶鲁公开课 - 心理学导论课程节选

how their perspectives and backgrounds are different from people who grew up in the United States.

就是观察这些留学生与在美国长大的学生在观念以及背景方面的差异。

尊重多样化 - SpeakingMax英语口语达人