对于正规的第一和第二马赫。

For the canonicity of I and II <em>Mach</em>.

翻译为如何马赫成本向立陶宛…

How <em>mach</em> cost shiping to Lithuania?

今天，我们谈的不是跨音速飞行，甚至超音速飞行，我们谈的是特超音速飞行，不是2马赫或者3马赫，而是20马赫。

Today, we don't talk about flying transonically,or even supersonically, we talk about flying hypersonically not <em>Mach</em> 2 or <em>Mach</em> 3, <em>Mach</em> 20.

你飞不了20马赫，除非你继续飞。

You can't learn to fly at <em>Mach</em> 20 unless you fly.

这种合并现象就叫做“马赫效应。”

This fusion phenomena is called the "<em>mach</em> effect."

有时，我觉得我们的最低速度就是3马赫。

Sometimes I think our minimum speed is <em>Mach</em> 3.

低马赫数亚声速外流时，性能损失随外流马赫数的增加成近似线性增加；

For subsonic free stream, performance losses almost linearly increase with increasing <em>Mach</em> number.

本文还提出了一种确定不起动马赫数的方法。

The method for the unstart <em>Mach</em> number is described.

我在军用推力状态下第一次飞过了1马赫。

I was in military power the first time I went through <em>Mach</em> 1.

也就是每小时1万8000英里，超过23马赫（23倍音速）！

That's 18,000 miles an hour, just over <em>Mach</em> 23!