She had run up a huge phone bill.
她已经欠下了一大笔电话费。
She had run up a huge phone bill during the course of the relationship.
她在这种关系期间，使电话帐单增长很大。(这句翻译的感觉不通顺)。
Nowadays calling a mobile phone is also not very expensive so there's no need to worry about racking up a huge bill.
而且现在手机的资费不太贵，所以不用担心会花费太多电话费。
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