VOA慢速英语:词汇节目:提高标准

idiom –n. an expression that cannot be understood from the meaning of its separate words

standard –n. a level of quality or performance that is considered acceptable or desired

semester –n. one of two, half-year periods that make up an academic year at a school or college

pole vault –n. an athletic event in which people compete by using a pole to jump over a bar this is high above the ground

incrementally –n. a small amount by which something is made larger, greater or higher