critical torsional speed

例句：

1. 1.The critical torsional speed of the rotor is crucial for its operation.
   转子的临界扭转速度对其运行至关重要。
2. 2. In order to improve the efficiency of the machine, we need to optimize the critical torsional speed.
   为了提高机器的效率，我们需要优化临界扭转速度。
3. 3.The design of the gearbox must take into account the critical torsional speed of the transmission shaft.
   齿轮箱的设计必须考虑到传动轴的临界扭转速度。