总统可以对国会通过的法案行使否决权。
The president can exercise his ___veto power on bills passed by Congress.
市长否决了这项有争议的提案。
The mayor ___vetoed the controversial proposal.
总统行使了否决权，拒绝签署这项法案。
The president used his ___vetoes to reject the proposed bill.
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