馬赫數

Mach number (fluid mechanics)

surname He

awe-inspiring / abbr. for 赫茲|赫兹[he4 zi1], hertz (Hz)

surname Ma / abbr. for Malaysia 馬來西亞|马来西亚[Ma3 lai2 xi1 ya4]

horse / CL:匹[pi3] / horse or cavalry piece in Chinese chess / knight in Western chess

Mach (name) / Ernst Mach (1838-1916), German physicist / Mach number (fluid mechanics)

to count / to count as / to regard as / to enumerate (sb's shortcomings)

number / figure / several / CL:個|个[ge4]

frequently / repeatedly