oxygen tank
noun [ C ] uk/ˈɒk.sɪ.dʒən ˌtæŋk/ us/ˈɑːk.sɪ.dʒən ˌtæŋk/
氧气罐（充满氧气的容器，帮助病人或潜水者呼吸）
a container with oxygen inside it, used for helping people to breathe, for example when they are very ill, or when they are diving underwater
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