マッハ数 なら
mahhakazunara
1. If Mach number; When Mach number
Noun
#297423
1. If Mach number; When Mach number
1. several years; a few years
1. a few years ago; some years back
1. several times; a few times
1. several months
1. to count; to enumerate
1. frequency (esp. of waveforms)
1. Mach (number)
2. (at a) fast speed
1. (an) unknown; unknown number
2. unknown quantity; not yet known
1. often; again and again