first-class card
一流的卡片
以上为机器翻译结果，长、整句建议使用 人工翻译 。
But nanotechnology experts have unveiled a Christmas card so small that more than 8, 000 of them could fit on a first-class stamp.
但是纳米专家们已经展示了一种极小的圣诞卡，在一枚平信邮票上就能放超过8000个！
youdao
Leff, who has only ever flown first-class, has loyalty card status on all U.S. airline programs and currently has three million miles across all his accounts.
CNN: The fabulous lives of air miles millionaires
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