1. He was born dumb.
    他生来就哑。

2. A person who is deaf when he is born, is usually dumb as well.
    一个人在出生时就耳聋的话，一般他也会是个哑巴。

3. Although other people had written books about her, people agreed that her own books are the ones that best explain how it feels to be deaf, dumb and blind.
    尽管别人也写了她的传记，但大家一致认为她的自传最能体现一个又聋、又哑、又盲的人的切身感受。

4. Places that until recently were deaf and dumb are rapidly acquiring up-to-date telecommunications that will let them promote both internal and foreign investment.
    一些不久前还是信息闭塞的地方正在快速获得最新的通信技术，这将促进当地对国内外投资的吸纳。