Chemical basic concept is the refining and chemical knowledge distillation, chemical knowledge is a basic chemical building tools and the concept of vector.
化学基本观念是化学知识的提炼与升华，化学知识是构建化学基本观念的工具与载体。
2
The feature of the technology based on rough sets can dig out hidden rules and get potential knowledge through the continuous accumulation of routines, refining and study.
An outstanding student of knowledge barriers associated with basically non-existent, which precisely illustrates the refining teaching to improve on the outstanding student less obvious reasons.