In fact, however, Du Bois 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
Du Bois 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.