第3位总统候选人上场郑重发出挑战，令这次竞选充满悬念。
A third presidential candidate emerged to mount a serious challenge and throw the campaign wide open.
在这场漫长而紧张的选举中，每个人都在关注总统候选人，关注他们将如何改变美国。
Throughout this long, tense election, everyone has focused on the presidential candidates and how they'll change America.
今天他正式宣布他的总统候选人身份。
Today he is formally announcing his candidacy for president.
本周他们中的一人将被民主党提名为美国总统职位的候选人。
This week one of them will be nominated by the Democratic Party for the presidency of the United States.
修正案规定了总统的最长任职期(可任两期，每期四年)，为候选人参与选举创造有利条件，并限制了总统宣布国家进入紧急状态的权利。
They limit how long a President can serve (two four-year terms), make it easier for candidates to get on the ballot and restrict a President's ability to impose a state of emergency.
修正案规定了总统的最长任职期(可任两期，每期四年)，为候选人参与选举创造有利条件，并限制了总统宣布国家进入紧急状态的权利。
They limit how long a President can serve (two four-year terms), make it easier for candidates to get on the ballot and restrict a President's ability to impose a state of emergency.
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