...assembling this material into thematic groups.
按主题将这些材料整理分类
...the whole thematic approach to learning.
整个主题学习法
...a thematically-linked threesome of songs.
一组主题相关的三首歌
英汉双解词典包含141091条英汉词条,基本涵盖了全部常用单词的翻译及用法,是英语学习的有利工具。