teacher prejudice 为什么不用teacher's prejudice

teacher prejudice 是对老师的偏见
teachers' prejudice 所有格表示某人的,表示老师对别人的偏见
个人浅见!Teachers gave consestently lower grades on essays apprently written by boys named Elmer and Hubert than they awarded to the same papers when the writers' names were given as Michael and David .However ,teacher prejudice isn't the only source of classroom difference.中的结构是怎样？刚搜了一下，teacher prejudice用的情况比teacher's 略多一些!We did find an interesting relationship between the degree of the teacher's prejudice and the academic performance of the minority children in her class and 得出的结论，应该是两个都行， 前者更常用， 意思一样。抱歉上面说错了！