问题的关键是中国独特的户籍制度，又称户口，其目的是防止外来民工涌入人口更稠密的地区。
At issue is China's unique household registration - or hukou - system, which was intended to keep rural workers from flooding into more populous regions.
据《华尔街日报》消息，随着中国在亚太地区影响力的提升，日本视该协定为实现其经济和安全目标的关键。
According to a Wall Street Journal article, Japan views the agreement as key to its economic and security goals as China expands its influence in the region.
中国是全球最大的手机市场(按用户数量计算)，也是智能手机生产商相互竞争的关键地区。
China is the world's largest mobile market, by number of subscribers, and a key competitive area for smartphone makers.
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