| 单词 | Mach |
| 释义 | Mach (mɑːk ) uncountable noun Mach is used as a unit of measurement in stating the speed of a moving object in relation to the speed of sound. For example, if an aircraft is travelling at Mach 1, it is travelling at exactly the speed of sound. [technical] The hot air permitted higher speeds before the critical Mach number was exceeded. The aim is to fly at about Mach 2, twice the speed of sound. |
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