boolean system造句

The vast majority of retrieval systems currently in use range from simple Boolean systems through to systems using statistical or natural language processing techniques.
An example of a primary proposition is " All inhabitants are either Europeans or Asiatics . " An example of a secondary proposition is " Either all inhabitants are Europeans or they are all Asiatics . " These are easily distinguished in modern propositional calculus, where it is also possible to show that the first follows from the second, but it is a significant disadvantage that there is no way of representing this in the Boolean system.
It's difficult to find boolean system in a sentence. 用boolean system造句挺难的