On Wednesday night, he used a line-item veto to change a civil-service law that had been passed by Congress, which had the effect of changing the accounting regime for police officers' bonuses.

在周三晚，他动用单项否决权试图改变一个已经被国会通过的公务法案，该法案改变了对于警察奖金的会计准则(旨在削减警察和军人福利待遇)。

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This kind of accounting dispute, says Michael Garvin, a professor of civil engineering at Columbia University, often happens in cost-plus deals.

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