availability concentration
可用性浓度
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Unfortunately, it appears Nokia's restricting the 720's availability to very select regions, with an concentration on the Asian market ( China Mobile is a confirmed carrier).
ENGADGET: Nokia Lumia 720 preview: a slim and 'trendy' Windows Phone 8 handset for the social networking set (update: video)
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