trigger -- n. something that causes something else to happen -- for example, a subject that requires a professor to warn students that some might find the discussion troubling
comfortable -- adj. not causing any unpleasant or troubling feelings
athlete -- n. a person who is trained in or good at sports, games, or exercises that require physical skill and strength
national anthem -- n. a song that praises a particular country and that is officially accepted as the country's song
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
index -- n. a number that shows how something is changing or performing
ugly - adj. unpleasant to hear
challenge -- v. to say or show that (something) may not be true, correct, or legal