You could upgrade to first class.
您可以升级到头等舱。
Would you like to upgrade to First Class?
您想升到头等舱吗？
Could I get a free upgrade to first class, please?
请问，我可以免费升等到头等舱吗？
I would like to upgrade my airplane seat to first class.
我想把我在飞机上的座位调到头等舱。
I would like to upgrade my airplane seat to first class.
我想把我在飞机上的座位调到头等舱。
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