oxygen mask
['maillot', 'bathing cap, swimming cap', 'trailer truck, tractor trailer, trucking rig, rig, articulated lorry, semi', 'maillot, tank suit', 'switch, electric switch, electrical switch', 'backpack, back pack, knapsack, packsack, rucksack, haversack', 'nematode, nematode worm, roundworm']