Explain the features of different information retrieval systems.

Information retrieval systems are essential tools for accessing and managing vast amounts of information stored in various formats. These systems employ different features and techniques to efficiently retrieve relevant information based on user queries. Here's an overview of the features of different information retrieval systems:

1. Keyword-based Retrieval Systems:
   - Feature: Keyword-based retrieval systems rely on exact keyword matches between user queries and document contents. 
   - Advantages: Simple and easy to implement, fast retrieval speed.
   - Disadvantages: Limited by the exactness of keyword matches, inability to capture ____ _______ _______ ____ ___ ________ ________ _______ _________.
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