This is an advertising for drinks. From the proverb "come first, served. First" translated as "first come first served". In the advertisement, the clever will be "first" changed to "thirst", not only the pronunciation is similar, make people feel smooth and natural and the word "thirst" have "thirst", reminiscent of when you are thirsty, this drink will immediately your thirst. So this ad shows an irresistible attraction and powerful appeal..
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