compressed-air cylinder
/kəmpɹˈɛstˈeə ˈsɪlɪndə/
n
English · compressed-air cylinder中文 · 空气呼吸器Español · bombona de aire comprimidoFrançais · bouteille d’air comprimé
意味：Container filled with compressed air that allows the firefighter to breathe when the air is smoky or strongly contaminated.