extraction stop and non-return valve

例句：

1. 1.The machine is designed to extract metal from the ore.
   这台机器设计用来从矿石中提取金属。
2. 2. The process of extraction involves separating the desired substance from the rest.
   提取过程涉及将所需物质与其余物质分离。
3. 3. The company specializes in the extraction of natural oils from plants.
   该公司专门从事从植物中提取天然油的业务。