In 1931, 150 years after its modest beginnings in a London tavern, the quaint old drinking tune became officially the national anthem of the United States.

150年后的1931年，这首在伦敦小酒馆里诞生的不起眼的古老饮酒歌正式成了美国国歌。

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Ladies and gentlemen, please stand up for national anthem of the United States of America.

女士们，先生们，请起立，奏美利坚合众国国歌。

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Shortly after the singer's press conference on Thursday where she admitted singing to a backup track during President Barack Obama's inauguration, "National Anthem" became a trending topic in the United States on Twitter.

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