https://online2.tingclass.net/lesson/shi0529/0008/8118/131.mp3
https://image.tingclass.net/statics/js/2012
specialize 專(zhuān)門(mén)研究,專(zhuān)攻
emphasise / emphasize 強(qiáng)調(diào),著重
memorize / memorise 記住,熟記
flourish 茂盛,繁榮
fasten 扎牢,系牢
frighten 使驚恐,嚇唬
harden (使)變硬,(使)硬化
frown 皺眉,蹙額