求翻译：虽然美国黑人在奴隶制时期完全被关在文化大门之外，奴隶制废除之后又长期在教育上受到种种限制和阻碍，但因他们原本是一个英雄的民族，本来就具有和白人相同的生理禀赋，在艰苦环境里特别勤奋，所以历史上黑人中人才辈出，在科学文化的许多领域内作出了杰出的成就。是什么意思？

Although African Americans in slavery times completely shut the door in the culture, the abolition of slavery followed by long-term restrictions on education and obstacles, but they used to be a hero of the nation, already has the same physiological endowments and white , especially in difficult env

Although the United States completely black in time of slavery was abolished slavery in the cultural door again after long-term in the case of education, was subject to various restrictions and obstacles, but because they are originally was a hero of national, inherently and white same physical endo

Although the black Americans are closed completely in the slavery time outside the cultural front door, after the slavery abolishes for a long time receives all sorts of limits and the hindrance in the education, because but they are originally a hero's nationality, has originally with the Caucasian

Although United States Blacks at the time of slavery was completely closed in cultures outside long since they were the abolition of slavery in education are the constraints and obstacles, but because they used to be a national hero, would have had with whites the same physiological endowment, speci

Although United States Blacks at the time of slavery was completely closed in cultures outside long since they were the abolition of slavery in education are the constraints and obstacles, but because they used to be a national hero, would have had with whites the same