Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
primaries – n. elections in which members of the same political party run against each other for the chance to be in a larger and more important election
billionaire – n. a rich person who has at least a billion dollars or pounds
Republican Party – n. a political party in the United States
Democratic Party – n. a political party in the United States
open convention – n. a party convention at which delegates are free to vote for the candidate of their choice
