What operation is to expand the search scope and increase the life weight?

The way to expand the search scope is to use logical OR.

For example, A or B, the logical or table at this time satisfies both conditions A and B, so the search range can be expanded when using logical OR.

Logical operators are used to express ideas such as "and", "or" and "unless" in daily communication. Logical AND and logical NOT stand for AND respectively, unless, you can't expand the search scope.

Extended data:

1, logical AND

Use "AND" and "or"

* "said. Search terms used to connect concepts and restrictive relationships. Its function is to narrow the search range and improve the accuracy. The theme of my thesis is "Exploring the humanistic factors in literacy teaching in primary schools". For example, entering "literacy teaching * humanistic factors" in the full-text database of China HowNet China Journal means that the keywords searched include both literacy teaching and humanistic factors, and the search result has 1 record, which is "Chinese character culture exploration in literacy teaching".

2. Logical OR

Represented by "or" or "+". The search words used to connect coordinate relations have the following functions: expanding the search scope, preventing missing detection and helping to improve the recall rate. For example, "literacy teaching+humanistic factors" means all materials including literacy teaching or humanistic factors, and online Chinese journals have 1580 search results.