adj.唯一的She is the only girl in her family.她是家里唯一的女孩。
You seem to be getting fatter - the only answer is to do more exercise. (喻)你好象越来越胖了。唯一的解决办法是多活动些。
The only passengers, a young woman and her two baby daughters, were unhurt.飞机上的旅客只有一位年轻妇女和她的两个女婴儿，她们没有受伤。
It must be the only modern house in the district.这一定是本地区唯一的现代化住宅。