That staging point is expected to come at about the 124-second mark, when the supersonic Ares I-X rocket is traveling Mach 4.7? More than four times the speed of sound, its Max speed for the flight.

分离时刻预计在124秒时，这时超音速火箭战神i - X以4.7马赫的速度飞行——这是音速的四倍，也是飞行的最高速度。

youdao

I quickly increased our speed, calculating the time it would take for the weapons-most likely SA-2 and SA-4 surface-to-air missiles capable of Mach 5 - to reach our altitude.

我立即加速并计算着导弹到达黑鸟飞行高度所需的时间 - 它们很可能是苏联制SA-2和SA-4地对空导弹，最大速度可达3马赫。

youdao

The vim process that I am using to write this has, so far, issued 64K UNIX system calls, but only 88 Mach system calls and has sent and received less than 200 Mach messages.

我正在使用的VIM编辑器的进程，到目前为止，发送了64K的UNIX系统调用，但只有发送了88个Mach系统调用，并且，发送和接受的Mach消息少于200条。

youdao