mechanical seal with outside mounted spring

例句：

1. 1.The new machine has a mechanical seal with an externally mounted spring.
   这台新机器有一个外部安装弹簧的机械密封。
2. 2.The engineers were working on the design of a new mechanical seal with an externally mounted spring.
   工程师们正在设计一个带有外部安装弹簧的新机械密封。
3. 3.The mechanical seal with an externally mounted spring is widely used in industrial applications.
   带有外部安装弹簧的机械密封在工业应用中非常普遍。