basic characteristic of expert system的用法和样例：
- Understand and grasp the basic characteristics of isentropic flow.
- What is the basic characteristic of switches and hubs?
- This was characteristic of Negro singing that became a basic characteristic of jazz.
- Aiming at the characteristics of harvesting machinery design, the whole structure of design and evaluation expert system of sugar cane combine harvester is constructed.
- The most important and most basic characteristic of American culture is individualism.