In 2004 the number reached 315,000,000, with an average annual increase at 57,500,000.

到2004年，手机的数量达到3.15亿，平均每年增长了5750万用户。

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And the number is still growing at an average annual rate of 18%.

而这个数字还在以每年平均18%的速度增长。

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And the number is still growing at an average annual rate of 18%.

而这个数字还在以每年平均18%的速度增长。

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