preset screwdown

例句：

1. 1. The engineer preset the screwdown before starting the project.
   工程师在开始项目之前预设了紧固。
2. 2. The bolt was preset to hold the door shut.
   螺栓被预设来关闭门。
3. 3. The tool is preset for drilling holes in metal.
   该工具预设用于金属钻孔。