名词
中文翻译：未定日期的账单
同义词：
['unbilled bill', 'unpaid invoice例句：1. The company has yet to pay the undated bill for the new software.（公司尚未支付新软件的未定日期账单。）']
例句：
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1. The company has yet to pay the undated bill for the new software.
公司尚未支付新软件的未定日期账单。
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2. The undated bill was a surprise to the customer.
未定日期的账单给客户带来了惊喜。
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3.The undated bill was due to be paid by the end of the month.
未定日期的账单将在月底之前支付。