I never found his attitude a problem, though he is quite single-minded.尽管他相当固执，但我过去从未觉得他的态度有问题。She's a good teacher, but she can be fairly inflexible.她是个好老师，但有时候相当固执。He is an intelligent person, but he can be quite stubborn at times. 他是一个智慧超群的人，但有时相当固执。