hydraulic ratio

例句：

1. 1. The hydraulic system in the car needs to be checked regularly for optimal performance.
   汽车的液压系统需要定期检查，以保持最佳性能。
2. 2.In aerodynamics, the hydraulic ratio is crucial for designing efficient aircraft wings.
   在空气动力学中，液压比对于设计高效的飞机机翼至关重要。
3. 3. The engineer used a hydraulic ratio of 1:10 to optimize the machine's performance.
   工程师使用1:10的液压比来优化机器的性能。