If you are on a low income, you may be entitled to free dental treatment.如果收入低，你就可以享受免费的牙科治疗。Many families on a low income are dependent on state support.许多低收入家庭要靠国家补贴生活。It's a struggle to bring up a family on a low income.用微薄的收入抚养孩子很艰难。Elderly people often belong to a low income group.老年人往往属于低收入群体。