Hints: 本期学习的字源：du-=two二，dou为其变形 TIME Express 单词不需要大写，单词与例句或不同词条之间换行即可。 注解中详细介绍了单词的拆分与释义，是学习字源分析的重中之重！一定记得听写后来看注解！
double dual TIME Express serves the dual purpose of supplying information and aiding language acquisition. duet A duet requires two players or singers to perform. duplicity The ticket agent sold the same ticket to five different customers. This is a clear case of duplicity.
TIME Express serves the dual purpose of supplying information and aiding language acquisition. 《解读时代》具有双重使命：提供资讯以及辅助语言学习。 A duet requires two players or singers to perform. 二重奏（二重唱）需要两位乐手或歌手演出。 The ticket agent sold the same ticket to five different customers. This is a clear case of duplicity. 黄牛把同一张票卖给了5个人，这显然是欺诈。