boom n. 繁荣；吊杆；隆隆声 v.（使）兴旺
【真题再现】The once booming car market has become saturated.
曾经繁荣的汽车市场已经饱和了。
【CET-6,2003.09，阅读】
【联想记单词】联想：baby boomer 婴儿潮，生育高峰期
【活学活用】-Ancient Chang'an City was ever in a boom!
-古长安城曾经很繁荣！
