After the high-pressure Countdown round at this year's national Math Counts competition, in which the top 12 students went head to head solving complex problems in rapid fire, the finalists for the Math video Challenge took the stage to show their videos.
2017年6月六级真题（第三套）阅读 Section B
英英词典释义
Adjective
1. aggressively and persistently persuasive;
"a hard-hitting advertising campaign""a high-pressure salesman"