pole spring cap

例句：

1. 1.The new car has a unique design that is both practical and stylish.
   这款新车设计独特，既实用又时尚。
2. 2.The scientist used the latest technology to develop a new type of polar spring cap.
   这位科学家利用最新技术研发了一种新型极点弹簧盖。
3. 3.The polar spring cap was designed to prevent water from leaking out of the device.
   这种极点弹簧盖的设计目的是防止水从设备中泄漏。