Flow velocity, at this location, can never exceed the local speed of sound, and is said to be in a choked condition.

流速，在这个位置，绝不能超过当地音速的，据说是在一个呛条件。

youdao

Here the gas velocity corresponds to a Mach number of one, denoting that the flow velocity is equal to the local speed of sound of the particular gas.

在这里，气速对应到一个马赫数之一，指该流速等于当地音速的，特别是天然气。

youdao

Here the gas velocity corresponds to a Mach number of one, denoting that the flow velocity is equal to the local speed of sound of the particular gas.

在这里，气速对应到一个马赫数之一，指该流速等于当地音速的，特别是天然气。

youdao