Wearing a white cowboy hat, a checkered shirt tucked in around his blue denim jeans and scuff-less burnished tan boots, Grant Gilreath, an American college student from Tennessee
studying at UCLA, is the quintessential image of an American cowboy. He even has a small American flag hanging from his left shirt pocket.
注：本文中所涉及到的图表、注解、公式等内容请以PDF格式阅读原文