In fact, however, DuBois often shifted positions along the continuum between Washington and confrontationists such as William Trotter.
事实上，杜·波依斯经常在华盛顿和威廉·特罗特等对抗主义者之间转变立场。
3
DuBois was concerned that race was being used as a biological explanation for what he understood to be social and cultural differences between different populations of people.