名词
中文翻译：过时的账单同义词
同义词：
['outdated bill', 'outdated invoice', 'out-of-date bill']
例句：
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1. The company's outdated billing system is causing delays in the project.
公司的过时账单系统正在导致项目延误。
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2. The outdated billing system needs to be updated for efficiency.
过时的账单系统需要更新以提高效率。
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3. The outdated billing system has been a burden on the company's finance department.
过时的账单系统一直是公司财务部门的一个负担。