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The biggest write-down so far has been the $1 billion booked by AT&T, followed by one of $970m at another telecoms giant, Verizon.
至今为止最大的一笔账面价值减少是AT&T公司的预计的十亿美元,然后是另一家电信业巨头Verizon公司的9.7亿美元。
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