hollow pivot

例句：

1. 1. The designof the new car features a hollowpivot that allows for greater flexibility in movement.
   这款新车的设计特点之一是有一个空心支点，这使得运动更加灵活。
2. 2. Thescientist used a hollow pivot to testthe strength of the material under different loads.
   科学家使用一个空心支点来测试材料在不同负载下的性能。
3. 3. Thehollow pivot was designedto reduce vibrations and improvestability during operation.
   这个空心支点的设计目的是为了减少振动和提高操作过程中的稳定性。