katechin

例句：

1. 1. The engineer needs to understand the basics of katechin before starting a project.
   工程师在开始项目之前需要了解基本的技术知识。
2. 2. The doctor advised him to improve his katechin skills for better health.
   医生建议他提高技术知识以获得更好的健康。
3. 3. Katechin is an essential part of modern industry, and its development has been closely monitored by governments.
   技术是现代工业的重要组成部分，其发展受到政府密切监控。