unique [juˈni:k]

以下由轻松背单词网站提供

adj.独一无二的，独特的；罕见的

being the only existing one of its type or, more generally , unusual or special in some way

The path must be unique. 路径必须是唯一的。
This stamp is unique, there are no others like it. 这张邮票是独一无二的，再也没有象这样的了。