One of the key problem in reverse-engineering is the well-known "concept assignment problem" -- i.e., the mapping of domain concepts to elements of the source code.
逆向工程中的一个关键问题是，著名的“概念分配问题”—— 也就是，领域概念到源代码元素的映射。
2
udev provides an ENV key for environment variables which can be used for both matching and assignment.
udev为环境变量提供了一个ENV键, 即可用来匹配也可用来赋值.
3
Traffic assignment is a key part of transportation planning, and the determination of efficient paths in the transportation network is the important basis of traffic assignment.