精选优质文档-倾情为你奉上Unit 2 知识归纳词汇1struggle v&n.挣扎；努力；奋斗；斗争；艰难地进行(1)struggle to do sth.努力做某事；挣扎着做某事struggle against/with同作斗争struggle to ones feet挣扎着站起来struggle for 为而斗争；努力争取struggle on挣扎着，坚持下去(2)with a struggle 费劲地2expand vt.& vi. 扩大，增加；使变大；使增强；使膨胀；阐述；细谈(1)expand into/in.使扩大，变大；把扩展expand on/upon 阐述，详谈(2)expand.into.把扩展/发展成(3)expansive adj.易扩张的；易膨胀的；广阔的expansion n. 扩张；膨胀；扩大；发展Metals expand when they are heated.金属受热则膨胀。同类辨析expand，extend，s
