safety set screw

例句：

1. 1. The car's engineis secured with a safety set screw.
   这辆车的引擎用一个安全螺丝固定。
2. 2.The construction site was meticulouslysecured with safety set screws.
   施工现场被仔细地用安全螺丝固定。
3. 3. The engineertightened the safety set screws beforestarting the project.
   工程师在开始项目之前，先拧紧了安全螺丝。