问题描述：
英语翻译
Frequent fliers are often flying blind when it comes to knowing which airline consistently offers free seats in exchange for their hard-earned miles.
in exchange for their hard earned in exchage for hard earned blind = not knowing?
Frequent fliers are often flying blind when it comes to knowing which airline consistently offers free seats in exchange for their hard-earned miles.
in exchange for their hard earned in exchage for hard earned blind = not knowing?
问题解答：
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