Words and phrases
1.scam:( informal) a clever and dishonest plan for making money 欺诈；诈财骗局
2.chromatography n [uncountable ] ( chemistry 化 ) the separation of a mixture by passing it through a material through which some parts of the mixture travel further than others 色谱法，色层分析法，层析法（利用混合物各部份在介质中的通透距离差异而将其分离的方法
3.top-tier institution 一流机构
4.archipelago n a group of islands and the sea surrounding them 群岛；列岛；群岛和周围的海
Sentences
1.The U.S. Food and Drug Administration beefed up efforts to combat youth smoking.
美国食品药品管理局努力控制青年人吸烟
beef sth↔ˈup( informal) to make sth bigger, better, more interesting, etc. 使更大（或更好、更有意思等）
