Mach-number computer

例句：

1. 1. The rocket's speed is measured in Mach numbers.
   火箭的速度是以马赫数来衡量的。
2. 2. The aircraft's altitude was determined by its Mach number.
   飞机的高度是通过其马赫数来确定的。
3. 3. The scientist used a Mach number of 0.5 to calculate the velocity.
   科学家使用0.5的马赫数来计算速度。