Language is an abstractsystem used for human communication.
语言是研究人与人之间交际的抽象系统。
2
Finally the paper discussed the performance of automatic abstractsystem.
最后对自动摘要系统的性能进行了讨论。
3
The abstractsystem that an author constructs exists only in his mind, and the physical manifestation — the book — is only a convenient means of storage and distribution.