hydrody-namic mechanical seal

例句：

1. 1. The new engine uses a hydrodynamic seal to reduce friction.
   这款新发动机使用了水动力学密封来减少摩擦。
2. 2.The hydrodynamic design of the car's body helps it accelerate more efficiently.
   汽车车身的水动力学设计有助于提高其加速效率。
3. 3. The hydrodynamic turbine is used in many industrial applications where high efficiency is required.
   水动力学涡轮机在许多需要高效率的应用中被使用。