求翻译：It was at the age of 20 that Hawking first noticed something was wrong with him . He started to bump into (碰撞) things , and once or twice fell over for no reason . When he visited his family at Christmas time , his father was so worried that he made him see a doctor . Hawking was sent to hospital for test . He had moto是什么意思？

待解决 悬赏分：1 - 离问题结束还有