他已戴上氧气罩，旁边的便携式氧气罐就像一只忠诚的狗一样躺在地毯上。
He's got his oxygen on, and the portable tank next to him on the rug like a faithful dog.
万一生命线断了，人就只能活一到二分钟—就像呆在太空中或水下却没氧气一样没有生存希望。
Should a lifeline break, a man might live a minute or two — as helpless as if he were out in space or under water without an oxygen supply.
对于我们来说，安全就像氧气一样。
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