An entrance poll is a poll that is taken before voters have cast their votes at the polling stations. It is akin to an opinion poll in the sense that it asks who the voter plans to vote for or some similar set of questions.
权威例句
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Entrancepoll results also showed that the economy and illegal immigration ranked first and second on the minds of GOP voters, with 38 percent and 34 percent, respectively.
CNN: Conservatives, late deciders boost Romney in Nevada GOP caucuses