radial double mechanical seal

例句：

1. 1.The new radial double mechanical seal is more efficient than the old one.
   新的径向双机械密封比旧的更高效。
2. 2. The engineers are working on a radial double mechanical seal design.
   工程师们正在研究一种径向双机械密封设计。
3. 3. The radial double mechanical seal has been tested under various conditions.
   径向双机械密封在不同的条件下都经过了测试。