The US market for headphones this past year was $2 billion, up 79% from last year, according to NPD.

据美国市场研究公司NPD报告，去年，美国耳机市场的规模是20亿美元，比前一年增加了79%。

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The PS3 has been outsold by Microsoft's Xbox 360 for 20 months running in the US - the world's biggest games market, according to data from NPD.

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