additional second piece of luggage

Could you tell me how much it will cost to issue an additional second piece of luggage weighing 20 kg when flying from Nha Trang to Moscow? Can I pay for it in advance or only at the airport during check-in? 您能告訴我從 芽莊 飛往 莫斯科 的航班，額外托運第二件重量為 20 公斤的行李需要多少錢？我可以提前付款嗎？

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