NCAA refers to the American College Sports Association, which is an association composed of hundreds of American colleges and universities. Its main activities are various sports leagues held every year, among which the basketball league in the first half of the year and the rugby league in the second half of the year are the most concerned. In NCAA, more than 0/000 four-year universities in the United States and Canada are divided into three grades and dozens of leagues, playing football, basketball, volleyball, rugby and other sports such as track and field, gymnastics and wrestling. NCAA is one of the most important events for American college students after studying abroad.