空气取样

air sampling

empty / air / sky / in vain

to empty / vacant / unoccupied / space / leisure / free time

air / atmosphere

gas / air / smell / weather / to make angry / to annoy / to get angry / vital energy / qi

gas; air / smell / weather / to make angry; to annoy; to get angry / vital energy; qi

to take / to get / to choose / to fetch

to take a sample

manner / pattern / way / appearance / shape / classifier: kind, type

air sampler