带上氧气面罩。
Put your oxygen mask on before assisting others.
戴好自己的氧气罩之后再去帮别人。
This is why airlines ask you to put on your oxygen mask first.
这就是为什么航空公司要求你首先带上氧气面罩。
They tell you to put your oxygen mask on first and then help your child with his.
他们让你先戴好氧气罩，你然后再帮助你的宝宝获得氧气。
They tell you to put your oxygen mask on first and then help your child with his.
他们让你先戴好氧气罩，你然后再帮助你的宝宝获得氧气。
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