这句话看不太明白，各位帮帮忙～

racially-based negative prejudgements against a group generally accepted as a race in any given region of ethnic competition.

谢谢～～

试试吧。偶感觉你给出的这段话不太像一个完整的句子。

基于人种的，对一个群体的负面的预先判断，而这个群体通常被做为一个种族接受，这种接受是在任何一个特定的存在种族竞争的地区

全句是这样的：

His thesis works relatively well when applied to discrimination against Blacks in the United States，but his definition of racial prejudice as "racially-based negative prejudgments against a group generally accepted as a race in any given region of ethnic competition，" can be interpreted as also including hostility toward such ethnic groups as the Chinese in California and the Jews　in medieval Europe.

我贴出来的是句子中的“他”对种族偏见下的定义，这个看不太明白，其他的都还简单～

generally accepted as a race in any given region of ethnic competition应该是修饰a group的吧

也就是说,racial prejudice is the prejudgements against a certain group

他对种族偏见的定义是“一种基于不同人种思想的负面的预先判断，这种预先判断（偏见）常常针对在某个特定的存在种族竞争区域里的一个种族群体。”

后面有对这种被针对的种族群体做解释：比如在加州的中国人，在中世纪欧洲的犹太人。