Hxen.com's tips：Every day persisted can learn English well!-->■Learn English Everyday■
convention – n. a large meeting of people who come to a place for usually several days to talk about their shared work or other interests or to make decisions as a group
principled – adj. having, based on, or relating to strong beliefs about what is right and wrong
runoff - n. an additional race, contest, or election that is held because an earlier one has not resulted in a winner
survey – n. an activity in which many people are asked a question or a series of questions in order to gather information about what most people do or think about something
