Letting her friend borrow her car was an impulsive act that she immediately regretted. 让朋友借走她的车是她立刻就感到后悔的冲动行为。
When he had reached the upper landing an impulsive sidewise glance assured him, more clearly than before, of her uncommonly prepossessing appearance. 他走到了楼梯顶,禁不住又回过头来侧眼看了看,这才看清她那非常动人的面貌。