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AT&T plans to spend 18 billion dollars in 2010 upgrading its wireless networks to handle the increasing amount of new traffic.
AT&T計劃在2010年花180億美元升級其無線網絡，以應對不斷增加的新流量。
This is roughly 2 billion more than the company had invested in the previous year.
這比該公司去年的投資多20億美元。
Specifically, AT&T will add 2,000 new cell sites and upgrade existing cell sites with three times more fiber links than it had in 2009.
具體地說，AT&T將增加2000個新的基站，并升級現有的基站，其光纖連接數量是2009年的4倍。
This will increase capacity to connect the cell towers to AT&T's main network.
這將增加連接基地臺和AT&T主網絡的容量。
AT&T, which is the only wireless operator in the U.S. selling the iPhone, has been the target of much criticism over this past year,
AT&T是美國唯一一家銷售iPhone的無線運營商，在過去一年中一直備受批評，
as many iPhone subscribers, particularly in densely populated urban areas, have complained about dropped calls, slow Internet access, and poor service.
因為許多iPhone用戶抱怨電話掉線、互聯網接入速度慢、服務質量差，尤其是在人口密集的城市地區。
Some critics claim the company has not been spending enough on network upgrades to keep up with growing demand.
一些批評人士稱，該公司沒有在網絡升級上投入足夠的資金，以滿足不斷增長的需求。
AT&T has acknowledged that it has faced some difficulties, particularly in big cities.
AT&T已經承認它面臨一些困難，尤其是在大城市。
But the company is "closing the gap."
但該公司正在“縮小差距”。
