Unit 2 Language
一.重點單詞短語
1代表 stand for 2 手勢語 sign language
3 欣慰的微笑 a beaming smile 4 盤旋 fly in circles
5通知某人某事 inform sb.of/about sth 6在整個歷史上 throughout history
7難以理解的規(guī)則 confusing rules 8 由…組成 consist of/be made up of
9由…發(fā)展起來的 develop from 10 官方語言 official language