White House officials say that is a worthy goal, but they are focused more on each nation setting its own mid-term targets.
白宫官员说，这是很有价值的目标。但是，他们更关注的是每一个国家都设定自己的中期目标。
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Formal schooling in a classroom setting has been the most common means of schooling throughout the world, especially in developed countries, since the early and mid 19th century.