二級頭呼吸器

(diving) regulator / demand valve

two / 2 / (Beijing dialect) stupid

grade 2 / second class / category B

level / grade / rank / step (of stairs) / CL:個|个[ge4] / classifier: step, level

second stage (diving)

head / hair style / the top / end / beginning or end / a stub / remnant / chief / boss / side / aspect / first / leading / classifier for pigs or livestock / CL:個|个[ge4]

suffix for nouns

to call / to cry / to shout / to breath out / to exhale

variant of 呼[hu1] / to shout / to call out

to breathe

to breathe / to suck in / to absorb / to inhale

ventilator (artificial breathing apparatus used in hospitals)

device / tool / utensil / CL:臺|台[tai2]

backup regulator / octopus (diving)