expansion ratio of turbine

例句：

1. 1.The new turbine is designed to increase efficiency by a factor of two.
   新涡轮的设计是为了提高效率，提高两倍。
2. 2.The turbine's expansion ratio is critical for its performance.
   涡轮的膨胀比对其性能至关重要。
3. 3. The engineer analyzed the turbine's expansion ratio and found it to be within acceptable limits.
   工程师分析了涡轮的膨胀比，发现它处于可接受的范围内。