Machmeter
[mɑ:k,mi:tә]
解释:
(noun.) speedometer for measuring the speed of an aircraft relative to the speed of sound.
编辑:维姬--From WordNet
[mɑ:k,mi:tә]
(noun.) speedometer for measuring the speed of an aircraft relative to the speed of sound.
编辑:维姬--From WordNet