blow-off velocity

例句：

1. 1.The blow-off velocity of the gas is very high.
   气体的吹出速度非常高。
2. 2. The blow-off velocity is a critical factor in determining the efficiency of the engine.
   吹出速度是决定发动机效率的关键因素。
3. 3. The blow-off velocity of the gas is measured using a special device.
   气体的吹出速度是通过一种特殊的设备来测量的。