(航空)低于声速(在相同介质、相同温度和压力下)。；次音速的；[医] 听域下的
频率低到无法听见的。
having a frequency too low to be audible
(航空)低于声速(在相同介质、相同温度和压力下)。
(aviation) less than the speed of sound (in the same medium, and at the same temperature and pressure)
马赫数在0.3至0.8之间(近似值,确切范围因来源而异)。
with a Mach number such that 0.3 < Ma < 0.8 (approximately - the exact limits vary between sources)
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