universal class的用法和样例：
例句
- A class of combinatorial optimization problems has the characteristic that problem space can be mapped into a set of permutations.
摘要针对问题空间为全排列集合的一类组合优化问题，提出了一种混合进化算法。
universal class的相关资料：
临近单词
universal bar
universal
Universal Suez Canal Company
Universal Convention of Post
Universal Military Simulator
universal joint sliding yoke
universal joint splined shaft
universal electron microscope
universal side cutting pliers
universal research microscope
universal-enumeration judge
universal turbulence constant
