The writer seems to vacillate between approving of Collins’ actions and finding them disgusting.对柯林斯的行为，作者一会儿赞成，一会儿又厌恶，看来还拿不定主意。The earthquake caused the entire house to vacillate.地震使整个房屋摇晃。The earthquake caused the entire house to vacillate.地震使整个房子摇晃起来。