通常，公司可能有一些账单、帐目管理以及类似的支持不同业务方面的系统。
Often, a company may have several billing, account management, and alike systems supporting different aspects of business.
业务规则可能会非常快地变动，账单规则必须相应地改变。
Business rules can change fairly quickly and the billing rules need to follow.
并非只有美国律师重算账单，一些业务遍布全球的伦敦法律公司也面临着竞争和更加挑剔的客户。
American lawyers are not the only ones recalculating their bills. London firms with a global spread are also facing competition and more demanding clients.
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