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。
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。
The emerging sunspot region seems to boost the local speed of sound, thereby hastening the refracted return of sound waves passing through that part of the solar interior.
浮现的黑子区似乎能使当地的声速增加，从而使声波更快地通过这个区域。
The emerging sunspot region seems to boost the local speed of sound, thereby hastening the refracted return of sound waves passing through that part of the solar interior.
浮现的黑子区似乎能使当地的声速增加，从而使声波更快地通过这个区域。
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