给出一个关键词和一篇文章，要求从文章中找出包含该关键词的所有句子，并将这些句子返回。


关键词: computer
文章: Computers are essential tools in today's world. They can be used for communication, work, research, and entertainment. Many people rely on computers to complete their daily tasks. However, computers can also be a source of frustration when they don't work properly. Despite their occasional flaws, computers have revolutionized the way we live and work.
包含关键词“computer”的句子如下： 

- Computers are essential tools in today's world.
- Many people rely on computers to complete their daily tasks.
- However, computers can also be a source of frustration when they don't work properly.
- Despite their occasional flaws, computers have revolutionized the way we live and work.